Hopefully he doesn't move on to starting his own platform.He's had trouble securing funding and basically has buyers remorse.
He has a contract with twitter under what conditions he can back out. I've read into it a lot and tbh Elon is probably screwed here. Twitter will sue to enforce the contract and Elon will have to prove his exit conditions were met. He's trying to proclaim the numbers around "fake accounts" is his reason. If that is his legal strategy he is beyond fukt as it won't hold up in court.