X (formerly Twitter) has terminated the European Commission's advertising account just one day after the platform received a substantial fine of approximately $140 million from the regulatory body. Nikita Bier, X's head of product, accused the European Commission of exploiting a vulnerability in the Ad Composer system to artificially boost the reach of their post announcing the fine. According to Bier, the commission logged into their dormant ad account to take advantage of this exploit, posting a link that misled users into thinking it was a video. While Bier stated that the exploit has now been patched, X proceeded to revoke the European Commission's ability to purchase and track advertisements on the platform. This action comes despite X still needing to submit specific measures and an action plan to address the concerns that led to the fine, which was the first-ever penalty under the Digital Services Act. The European Commission had cited issues with X's verification system, lack of advertising transparency, and insufficient data provision for researchers. In response to the fine, X owner Elon Musk dismissed the regulatory action as 'bullshit' on the platform.

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