You can't post bestiality, incest or loli on Patreon. Ok, you can post it, but if you get reported, they will nuke your entire page, and this chance grows exponentially as your amount of subscribers grow. That's why AnimoPron, Bad Onion, Mr Dots, 4 Minute Warning, Ark Thompson and more closed their patreons and migrated to SubscribeStar that currently does not have any limitation on any of those kinks. Or you can be a wet blanket like DarkCookie, stay on Patreon and convert your incest-centered game onto landlady and roommate saga.
That's why the Steam version has to be the complete one.