There is a difference between curating your platform and forming worldwide blacklists. That's a deliberately alarmist comparison. You're trying to draw a line between not receiving direct support and being outright suppressed. People are not oppressing you by not agreeing with you, or by not sharing your views, or helping you spread them with their own resources.
We aren't talking about a paper company that provides basic, generic tools for thousands of disparate uses. We are talking about a distribution service. Your argument is like saying freight companies should just not care what gets put on their trucks, it's all freight, their objections to being kept in the dark as to the things they are directly involved in the handling of are irrelevant. You are not entitled to the use of their space simply because you want to use it.
So yes, if you have a specific type of content that isn't serviced by widespread hosting platforms, you have to make your own, and that is ok. Barnes and Noble carries the Holy Bible because people buy it, not because my religion is entitled to space on their shelf. If they stopped offering a variety of Christian literature, I'd be sad, but also not oppressed, and us religionites would probably start founding special book stores, oh wait that's exactly what we did for decades.