It boils down to accountability
When a dev makes a shit game on steam, it obviously gets negative reviews and word of mouth spreads through media and reddit that the game is not worth buying for whatever price it is. Dev either keeps patching the game to make it better or take the L and move on. People stop buying that game after a period and it dissolves into irrelevancy.
There is no such thing for adult games and Patreon, so we get devs like irphaeus who keep edging his supporters for maybe 1-2 updates per year with minimal effort and still walk away with thousands of dollars every month. There is no accountability since it depends on the individual supporters to cancel their subscription, but many simply forget to cancel it or rich whales who couldn't care less about that $5 charge every month because they can't be bothered to find their login and go through the cancellation process.
The point is, hurt his wallet. Unless there is a massive drop in his subscriber count and him being the greedy fuck that he is, when he sees lesser and lesser money coming in, he'll move his ass otherwise this dripfeeding will keep continuing until morons keep throwing money at him. Pirate the game rather than ever supporting him, that's how you'll get back at him.
It is also one of my biggest pet peeves of adult games and F95, you're expected to keep subscribing every month when any indie game out there you pay 20-30 bucks once and you have lifetime access to the game and all its updates. On Patreon, you sub for only that month, and you have to continue the sub, or you don't get any updates after that unless you shell out the money again... Something you already paid for.