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.