Usually the challenge isn't having to build your own economy to back the business you already built.
I believe the reason is that few-to-no super wealthy RW interests are lining up to fund a Gab-like echo chamber.
As far as hosts go, if A-H say "We'd prefer you not amplify misinformation here", that's business. No whingy snowflakes here. We'll go to I-Z (and the 500 Dr.Suess letters that come after) until we find one that does.
This is certainly doable. Far more harmful stuff is hosted every day.