In the EU, App stores already have a legal responsibility to remove apps that promote hate speech. While both Google and Apple are sitting on the sidelines while the EU is going through the legal motions to tear Musk a new one, I wouldn't be surprised if they kick X out just before someone forces them too, just to pretend they actually care.

[gestures vaguely]

They already have no problem pulling other apps for shit that Xitter is known to pull. Even when said other apps have a similar lack of control (or even less) over said content.