“I’m not going to stand for this” Dude just move to another instance. Literally no one is stopping you. It’s the whole reason for the fediverse. They can manage their instance as they see fit. You sound like a complete keyboard warrior, get over yourself and move on.
There is a Decky plugin. (I believe it’s called DeckSettings)
No idea where it sources the info - but it does exactly what you ask, right on the Deck in gaming mode.