There are a number of bad actors who I'm sure would love to pay into TwitX for the ability to push propaganda, etc. It may be worth it to Misk himself to just keep footing the bill as well for that reason alone.
I doubt there's much chance of it going under anytime soon.
Bought in heavy to the PS ecosystem already? Or just prefer it? Don't want to pay the extra $100 or $200 (steam deck)? It's not for me but I could see people doing it.
It has to be something else that hasn't been revealed yet.