Elon Musk’s X became the first large online platform fined under the European Union’s Digital Services Act on Friday.

The European Commission announced that X would be fined nearly $140 million, with the potential to face “periodic penalty payments” if the platform fails to make corrections.

A third of the fine came from one of the first moves Musk made when taking over Twitter. In November 2022, he changed the platform’s historical use of a blue checkmark to verify the identities of notable users. Instead, Musk started selling blue checks for about $8 per month, immediately prompting a wave of imposter accounts pretending to be notable celebrities, officials, and brands.

Today, X still prominently advertises that paying for checks is the only way to “verify” an account on the platform. But the commission, which has been investigating X since 2023, concluded that “X’s use of the ‘blue checkmark’ for ‘verified accounts’ deceives users.”

This violates the DSA as the “deception exposes users to scams, including impersonation frauds, as well as other forms of manipulation by malicious actors,” the commission wrote.