It is the same set of considerations that govern Lemmy instances: the admins are irl people who have whatever ideas they like to see happen in the world, and it’s their personal machines and effort that they are putting into administering the instance, so they get to do whatever they please. If you like those philosophies (which they tend to say in their sidebars), then you can make an account on them - FOR FREE - and if not, then you are free to go elsewhere.

Fwiw, piefed.zip avoids defederation as much as possible iirc and has an affinity for gaming topics, piefed.social is one of the oldest but note that it tests deployment of all the newest features, so it can break more readily than a more stable instance, piefed.ca is located in Canada and geared towards people who live there but like the Lemmy version, all are welcomed, and piefed.world is run by the same admins who handle lemmy.world, with all that that entails - some people love that fact, others will hate it, and again it’s all fine and good bc there is room for us all to coexist peacefully across the Threadiverse:-).