the reason is because pawoo and baraag are de-facto lolicon servers with neither the censorship requirements of pixiv or the content moderation of twitter.
servers in different countries are going to have different laws and different cultural mores so you will no longer have the twitter model of curating the world's content by the standards of California progressivism which will probably also result in a far more fractured set of communities. considering the kinds of harassment artists are subject to on twitter, i don't even know if that is a bad thing.
My average Twitter moderation experience is getting an email back saying my reported tweet from RomanStatue1488 saying “The Jews took this from us” with a picture of 50s nostalgia art didn’t break any rules. (Direct quote.)
California has little to do with it. You won’t be nearly as happy with a site run under the laws of a non-US country though.
