In a world where big tech and governments are requiring user-facing things to do things (like age verification, etc) and be liable for what their users do with it, even the self-host becomes a problem unless you are your only user. There are plenty of people that are still doing it, but they're probably taking on liability they don't realize. For example if I stand up a self-hosted git forge and allow others to use it, and some user I don't know commits CSAM to their repo, to quote (paraphrased cause I don't remember exactly) Dijkstra from The Witcher: That's called being in the shit, and you're in the shit.

I mean, this is the case for a lot of things? Has always been the case.

If you host friends over for dinner at your house a lot, nobody will ever say you are subject to the same rules as a restaurant. You start letting other people host dinners at your house, and things could change. You start letting people solicit your place for paid dinners, similar outcome. Do it once, nobody will probably know or care. Continue to do it at scale, though, and I don't know why you would expect to not be subject to regulations.