A pivot in leadership is unfolding across the Atlantic as Margrethe Vestager announced her exit as Europe’s chief competition regulator to launch her candidacy to head the European Investment Bank. Under her auspices, the European Union (“EU”) led the charge against the world’s largest tech companies, with the spotlight often gleaming on companies like Google, which weathered fines eclipsing €8 billion from 2017 to 2019 for breaching EU competition laws. Despite these significant financial penalties, allegations of persistent non-compliance and monopolistic practices endure. Today, while the US relies on century-old laws to police “Big Tech”, the EU is at the forefront of developing regulations for the same objective.
In the US, the antitrust narrative morphs into a peculiar dichotomy. After a period of declining enforcement, regulators are now embracing the Biden administration’s policy objective “to enforce the antitrust laws to meet the challenges posed by new industries and technologies, including the rise of the dominant Internet platforms.” The list of cases against big tech include the likes of Amazon and Google, with the latter being described as “the biggest tech monopoly trial of [the] 21st Century.” Despite the amplification of cases against the tech giants, doubts loom whether “the current enforcement system is too slow, too complex and too cumbersome.” Though proposed changes to the regulatory clearance process for mergers and acquisitions indicate the US seeks to maintain an aggressive posture towards enforcement, tangible legislation remains elusive, with bipartisan efforts to regulate online platforms’ anti-competitive behavior stuttering before reaching the President’s desk. 
Conversely, the EU has sculpted a notably distinct trajectory with the enactment of the Digital Markets Act (“DMA”) in November 2022, just two years after its proposal by the European Commission (“Commission”). The DMA establishes regulatory safeguards to ensure fair and open markets in digital sectors within the EU. Specifically, the protections regulate the behavior of large online platforms that provide a “gateway between business users and consumers.” The criteria to reach “gatekeeper” status requires meeting certain quantitative thresholds and possessing a considerable degree of market power. If a company earns the designation of a “gatekeeper,” it is subject to the obligations and prohibitions outlined in the provisions of the DMA.
For non-compliance, the Commission may impose fines “not exceeding 10 % of [the gatekeeper’s] total worldwide turnover,” and “20 % of its total worldwide turnover in the preceding financial year where . . . . a gatekeeper has committed the same or a similar infringement.” As the DMA exits its implementation phase in 2023, companies will begin to be notified of their gatekeeper designations and subsequently look to take the requisite steps to ensure compliance by March 2024. Commentators speculated that big tech would populate the initial list of designated gatekeepers, and a day after Commissioner Vestager made her announcement, the Commission announced six gatekeepers including Amazon, Apple, ByteDance, Meta, Microsoft, and Google’s parent company, Alphabet 
The DMA is not without its critics, and it would be too early to speak to its success. However, the significance of the DMA does not only lie in what it seeks to achieve but also in what it represents. The framers of the document acknowledged that existing competition laws were inadequate to reach the DMA’s regulatory objectives because of the reactionary nature of those very laws that “require . . . an extensive investigation of often very complex facts on a case by case basis. With uncertainty as to any new and significant antitrust legislation in the near future, the question remains whether the laws enacted a century ago, to combat the monopolies of the industrial age, are fit to address the challenges of a new, technological era.
 Giovanna Faggionato, Margrethe Vestager goes on leave from the European Commission, Politico (Sept. 5, 2023, 7:02 PM), https://www.politico.eu/article/margrethe-vestager-goes-on-leave-from-the-european-commission
 Samuel Stolton, The Total Eclipse of Margrethe Vestager, Politico (Apr. 13, 2023, 6:00 AM), https://www.politico.eu/article/margrethe-vestager-eclipse-european-commission-competition-2024-election
 European Commission Press Release IP/17/1784, Antitrust: Commission Fines Google €2.42 Billion for Abusing Dominance as Search Engine by Giving Illegal Advantage to Own Comparison Shopping Service (June 27, 2017); European Commission Press Release IP/18/4581, Antitrust: Commission Fines Google €4.34 Billion for Illegal Practices Regarding Android Mobile Devices to Strengthen Dominance of Google’s Search Engine (July 18, 2018); European Commission Press Release IP/19/1770, Antitrust: Commission Fines Google €1.49 Billion for Abusive Practices in Online Advertising (Mar. 20, 2019).
 Natasha Lomas, Act Now Before Google Kills US, 135 Strong Coalition of Startups Warns EU Antitrust Chief, TechCrunch (Nov. 12, 2020, 10:30 AM), https://techcrunch.com/2020/11/12/act-now-before-google-kills-us-135-strong-coalition-of-startups-warns-eu-antitrust-chief
 European Commission Press Release IP/22/1978, Digital Markets Act: Commission Welcomes Political Agreement on Rules to Ensure Fair and Open Digital Markets (March 25, 2022).
 Maurice E. Stucke & Ariel Ezrachi, The Rise, Fall, and Rebirth of the U.S. Antitrust Movement, Harv. Bus. Rev. (Dec. 15, 2017), https://hbr.org/2017/12/the-rise-fall-and-rebirth-of-the-u-s-antitrust-movement
 Exec. Order No. 14,036, 86 Fed. Reg. 36987, 36988 (July 14, 2021).
 Press Release, Fed. Trade Comm’n, FTC Sues Amazon for Illegally Maintaining Monopoly Power (Sept. 26, 2023).
 Dara Kerr, United States Takes on Google in Biggest Tech Monopoly Trial of the 21st Century, NPR, (Sept. 12, 2023, 5:00 AM), https://www.npr.org/2023/09/12/1198558372/doj-google-monopoly-antitrust-trial-search-engine
 Mark Scott, Washington Wants to Break Up Google. But Europe is Way Ahead, Politico (Feb. 2, 2023, 11:45 AM), https://www.politico.com/news/2023/02/02/google-antitrust-washington-00080614
 Premerger Notification; Reporting and Waiting Period Requirements, 88 Fed. Reg. 42178 (June 29, 2023); Press Release, Fed. Trade Comm’n, FTC and DOJ Seek Comment on Draft Merger Guidelines (July 19, 2023).
 European Commission Press Release IP/22/6423, Digital Markets Act: Rules for Digital Gatekeepers to Ensure Open Markets Enter into Force (Oct. 31, 2022).
 DMA pmbl., para. 16.
 Id. at para. 17.
 Regulation 2022/1925, of the European Parliament and of the Council of 14 September 2022 on Contestable and Fair Markets in the Digital Sector and Amending Directives (EU) 2019/1937 and (EU) 2020/1828 (Digital Markets Act), 2022 O.J. (L 265) 32 [hereinafter DMA].
 DMA art. 3, para. 1.
 Id. at para. 2.
 Anna Bosch, Digital Markets Act Explainer, The App Association (Nov. 10, 2022), https://actonline.org/2022/11/10/digital-markets-act-explainer.
 Mario Mariniello & Catarina Martins, Which Platforms will be Caught by the Digital Markets Act? The ‘Gatekeeper’ Dilemma, Bruegel (Dec. 14, 2001), https://www.bruegel.org/blog-post/which-platforms-will-be-caught-digital-markets-act-gatekeeper-dilemma.
 European Commission Press Release IP/23/4328, Digital Markets Act: Commission Designates Six Gatekeepers (Sept. 6, 2023).
 Aurlien Portuese, The Digital Markets Act: A Triump of Regulation over Innovation, ITIF (Aug. 24, 2022), https://itif.org/publications/2022/08/24/digital-markets-act-a-triumph-of-regulation-over-innovation.
 DMA pmbl., para. 5.