I dont think there are multiple privacy communities because of the donain names. Its because people disagree with and dont want to be on or associate with thise instances lemmy.ml is a tankie instance, dbzer0 is specifically only for anarchists, etc.

So its actually doing what the fediverse was designed to do, and allow people to have spin offs in their own flavor. Whatever the reasoning behind creating multiple of these communities is, Im almost certain it has nit been because the domain name was too unfriendly. This is especially apparent if you look at all the popular 196 communities and why they were made.

Not really, another user explained it, but 196 at blahaj and world needed to be splintered from because of the mods, and the one on pawb is sprcifically for furry memes. 19684 i think also has a specific gimmick but im not sure what it is. So none of them are really interchangeable