https://www.cnet.com/news/twitter-grapples-with-fake-elon-musk-accounts-promoting-bitcoin-scams/

Other businesses, including a book publisher and record label, have had their accounts taken over in the past. The attackers hijack a verified account, often with thousands of followers, and change the name and profile picture to impersonate Musk. They then ask users to send some of their own cryptocurrency to participate in the fake giveaway. 

It also appears that the scammers are purchasing ads through the social network to "promote" their tweets to more users.