No, I don't think that's what's happening here. I think people are theorizing that X is very likely to respond to pressure from Google and Apple threatening to deplatform them, and loudly complaining about them not applying their own rules equally is a great way to remind their internal lawyers to put pressure on them (insulting the CEOs is just a nice bonus).

Frankly, if the fallot here is a relaxed adult policy, that's still a win. LGBTQIA advocacy groups tend to get lumped in as 'adult', which is a problem for trans-affirming suicide prevention hotlines trying to save lives.

As for your slippery slope question, that Pandora's box is already open. Just half a year ago Mastercard and VISA put the strongarm on Valve and itch.io to let the payment processors ban any game they choose under the guise of pornography censorship. Pressuring a platform to censure an app 'for the sake of the children' just isn't the virgin ground you seem to think it is.