Buddy are you for real? It’s perfectly legal to sell under a fake name (or for instance, as an LLC) as long as you pay your taxes as your real identity!
You need to maybe not try to replace patreon if you’re this clueless.
There are several states where you can form an LLC without making your information public. In New Mexico you don’t even need to tell the state.
I can’t tell if you’re talking about the US though, if you’re referring to other countries it may be much more restrictive, lots of places seem to require ID and registration for basically anything.
I believe that if someone with a patreon wants their identity to stay private, making an LLC (depending on the name of it) may backfire?