Unfortunately this suffers from the 'Effective Target Audience: Assholes' effect.
It's basically impossible to start a YT or Patreon or Twitter alternative without either accidentally or actively pandering to people who have been kicked out of the main competitor, which mostly happen to be neonazis and/or fascists.
As such, most alternatives will immediately have their main pages full of hate speech and nazi propaganda. Even if there is a part of the user base that just wants an alternative to the Big Thing for other reasons, it quickly gets taken over and drowned out. Finally, after some time, the site just gets labeled as 'The Nazi {Patreon, Twitter, ..}' and every member becomes guilty by association, the community is just pure fash, and sometimes even gets dropped by advertisers/payment processors after public outcry.
See: voat (full of hate speech, basically a shelter for all banned reddit communities), gab (actively pandering to alt-right), subscribestar (paypal dropped them after public outrage), ...
I think the only 'alternative' I've seen not evolve into this is Mastodon, and that's probably because of how openly anti-fascist the first adopters (and developers) were, and because they didn't need to turn any profit.
I wonder if the same company could silo content to address this effect. Essentially have the same staff support multiple sites with identical backends. One which is child friendly, one racists, one for porn, ect. If creators get flagged too much, they just get bumped to a different silo, but you still take their money.
You can already do subscription products, but it's not quite enough to replace Patreon. That's about all I need to start nudging my handful of patrons over.
I tried one, called GameWisp, when a creator I support moved over there, but they skipped the "skilled employee" part. My subscription start date was rendered in their web app as "(null)", which doesn't inspire confidence in a payment processor. The creator shortly moved back to Patreon. Sigh.
