Twitter was only profitable for one year while it was public (2018). It's not like Elon could make that much worse. For what it's worth, he claims (edit: claimed before the advertisers left) it's break-even now.
As for competing services, Facebook has their work cut out for them. Active Daily User count on Threads has gone down 70% from it's bombastic launch. Average user engagement time has also gone down to 4 minutes from 19.
https://www.wsj.com/articles/threads-user-engagement-continu...
https://www.forbes.com/sites/willskipworth/2023/07/21/thread...