don't know about subscriberstar, but patreon is horrible. They limit artists greatly with purist rules. No bestiality, no rape I think and some other things I couldn't tell on top of my head right now. Purchasing from sites like itchio is a good way to go from my perspective. No assumptions, just informing.
Also subscriber plans like that is way too abused nowdays for milking patrons. A lot of great projects are basically dead milk fest because of it. Not a great practice to have that option imo