The Twitter account of Mira Murati, the chief technology officer of OpenAI, was apparently hacked on Thursday evening to promote a fraudulent cryptocurrency scheme.

The unauthorized tweets encouraged her followers to send money to an Ethereum digital wallet address to receive free “airdropped” coins as part of a new initial coin offering.

The incident highlights the risks of high-profile Twitter accounts being targeted by scammers seeking to use their credibility and wide followings to bilk money from people under false pretenses.

The apparent hacking of Murati’s account comes just four months after Twitter announced changes to its two-factor authentication policies that eliminated SMS text messaging as an option for account security, unless users pay for the Twitter Blue premium subscription service.