If it's like other crypto giveaway scams it works like this:
Twitter account impersonating some celebrity, e.g. Musk: "to show my love for crypto, I am giving some away. Send bitcoin to <some address> and I'll send double back!"
Replies from other Twitter accounts controlled by the scammer: "wow, I had my doubts but I sent some money and got double back. Now I'm rich. Thanks Musk!"
Marks: send crypto to that address and never get anything back.
People usually try with a small amount first. They might get that small amount back - which "confirms" they are getting something back. Then they send a larger amount.
