Elon's statement suggests forced "authentication" for all users, so that'll presumably be the end of anonymous Twitter profiles and the start of needing to prove identity at sign-up time:
https://twitter.com/elonmusk/status/1518677066325053441
They can expect to make a ton of money using their famously named blue checkmark account for "Elon wants to donate you 1 BTC! Click here" spam.