US Justice Department Backs Musk in X Advertiser Boycott Appeal

DOJ Urges Appeals Court to Revive Musk's Advertiser Boycott Claims

The U.S. Department of Justice has weighed in on Elon Musk's effort to bring back antitrust claims against 10 major advertisers that X accuses of organizing a group boycott. In a friend-of-the-court brief filed late Wednesday, the department asked the Fifth Circuit Court of Appeals to reverse a lower court's dismissal and allow the case to move forward.

The dispute began in 2024, when X sued the Belgian-based World Federation of Advertisers and its now-defunct brand-safety initiative, the Global Alliance for Responsible Media, over what it called a massive advertiser boycott. The individual advertisers named in the case are Ørsted, Shell, Mars, Nestlé, Tyson, CVS, Abbott, Colgate-Palmolive, Lego and Pinterest. X claimed at least 18 GARM members stopped advertising in late 2022, while dozens of others sharply reduced spending.

U.S. District Judge Jane Boyle dismissed the suit earlier this year, ruling that even if X's allegations were true, they did not establish an antitrust violation. She said X had not alleged that the advertisers intended to benefit a rival platform or that they tried to stop others from advertising on X. The Justice Department now argues that analysis was flawed, saying a boycott can be illegal if it is designed to force a company to change its product, terms of sale or business relationships.

The department stressed that it is not taking a position on whether the advertisers actually broke the law, only on whether X's complaint should have survived dismissal. According to the source, SpaceX, which now includes the remnants of what was Twitter, reported $367 million in advertising revenue in the second quarter of 2026, compared with the $1.076 billion Twitter reported in its last publicly traded quarter in 2022.

What the DOJ's Brief Means for X, GARM and the Accused Advertisers

The Legal Standard Under Pressure

Judge Boyle's dismissal rested on two narrow grounds: X did not allege the advertisers intended to boost a rival, and it did not allege they tried to block other companies from advertising on X. The Justice Department is challenging that framework directly. Its brief argues the alleged agreement among advertisers not to compete for ad space on X is enough to allege antitrust injury because the boycott aimed to influence X's product or content policies. If the Fifth Circuit accepts that broader theory, platform operators may find it easier to pursue claims when coordinated advertiser pullbacks are framed as pressure to change editorial or safety choices.

Why the Stakes Are Financial and Political

The revenue contrast is central to the dispute. The former Twitter's advertising business took in $367 million in the second quarter of 2026, while Twitter's last public quarter in 2022 showed $1.076 billion. X has argued the coordinated pullback cost billions. Legally, however, the appeal is still only about whether the complaint can proceed; the Justice Department has specifically avoided endorsing the claim that the advertisers actually violated antitrust law.

Where the Accused Advertisers and GARM Sit

The World Federation of Advertisers dissolved GARM in August 2024, days after Musk's lawsuit, while maintaining that its brand-safety standards were voluntary. The political backdrop also remains visible: Musk's suit came roughly three weeks after the Republican-led House Judiciary Committee issued a report accusing GARM of coordinating efforts to demonetize disfavored content. For the 10 named advertisers, a reversal would send the case back to the district court for proceedings and potential discovery, but it would not by itself establish liability.

Practical Implications for Advertisers and Online Platforms

• For the 10 defendant advertisers: Do not treat Judge Boyle's dismissal as final. The Justice Department's brief specifically seeks to overturn the legal basis for that dismissal, so the case could return to the district court even though liability has not been decided.
• For brand-safety groups and trade associations: The DOJ's argument that a boycott need not benefit a rival or block third parties could make voluntary coordination on advertiser pullbacks a more central antitrust question in future platform disputes.
• For online platforms: The Fifth Circuit's ruling will indicate how much an alleged coordinated ad pullback must target a competitor, or alter a platform's behavior, before an antitrust complaint can survive. That affects how platforms draft future boycott claims.
• For advertisers with content-safety policies: The congressional scrutiny of GARM is part of the same dispute. Expect policy decisions about where to advertise to remain politically visible while the appeal proceeds.