https://www.theverge.com/2018/7/24/17610348/twitter-elon-musk-display-name-change-lock-account-crypto-scams

Twitter has implemented a new method for combating cryptocurrency scammers: it now automatically locks unverified accounts that change their display name to Elon Musk. If you have a non-verified account that is not associated with a phone number, changing your display name to that of the SpaceX and Tesla CEO will result in an immediate lock out. Twitter will then ask you to pass a CAPTCHA test, as well as provide a phone number, to regain access.

“As part of our continuing efforts to combat spam and malicious activity on our service, we’re testing new measures to challenge accounts that use terms commonly associated with spam campaigns. We are continually refining these detections based on changes in spammy activity,” a Twitter spokesperson said in a statement given to The Verge. The company declined to comment on whether the measure has been put in place for any other public figure’s Twitter account.