I think that with Twitter purchase, Elon Musk received so much hate that he first needs to fight it all back, and only then think about integrating something. Just notice, no matter what he does, people still consider Twitter purchase as failure, they support "Twitter is bad" movement. So this makes his primary goal is to regain Twitter popularity, change peoples reception. Who needs dogecoin, btc, or any other crypto in Twitter, when people dont want to use it as they used to do.