Someone who is Mr. C's Patron, there's something that needs to be brought to his attention.
Summertime Saga, one of the biggest incest games on Patreon, has been put under review. If I'm not mistaken that game also had made changes to the text in the Patreon version to not refer actual incest, which means they are being very thorough with this purge thing.
I think CypressZeta, creator of another big incest themed game has the right idea: people need to strip Patreon of all game-related content. Delete everything, make a separate website to discuss stuff, show previews and etc, and keep Patreon solely as a fundraising platform. Here's his full post on the matter, I really don't think there's any other options now:
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The Patron-only releases and the previews could be posted (privately) on this blog/site he sets up and he mails the links to the Patrons according to their tier. Or he could set up an itch account, all the patrons need to do is connect their Patreon account to it and it would allow access to the pledge rewards accordingly.
However I don't know whether or not Patreon has access to what is being distributed through Itch, if it has, then it's not worth it (or maybe worth for distributing previews and other small rewards, but not the game itself)
Yes I'm aware that's a lot of work. But now it is pretty clear just trying to lay low and keep a clean page will NOT make you avoid the ban hammer.
If someone can pass this on to Mr. C (as I assume he would pay more attention to what a Patron says other than a random poster on an older post), or just explain things to him on a more cohesive way if you can (as his grasp of English isn't the best), I'd be thankful. Sitting and hoping will only mean the game will get purged, and making a patch as he said he was thinking about doing before will probably still not save him.
EDIT - A small correction, Sumertime Saga did NOT have altered text (replacing the incestuous themes with stuff like roomates and such), it was openly incestuous. I probably mixed it up with other game. The dev is in talks with Patreon to see if there's anything he can do (like making the aforementioned change in the story), so it's probably a good idea to keep an eye on that and see what Patreon will demand from him.
Also corruption has far more hardcore content than that game in general, so I don't think it's a good indicative anyways. Patreon has been enforcing only the ban on incest, but going by their new terms of use and content guidelines, anything they deem "fringe sexual content" is not allowed. And the examples of fringe sexual content they give are laughable, even basic shit like BDSM is too fringe for them. Who the fuck is running Patreon now, an association of christian mothers?
Anyway, that makes me worry that even if things pan out fine for the SS guy, it may not for Mr.C if he finds himself in a similar situation.