Google "Bill Ackman censorship Billionaire" to find the answer to your question He was the start of this censorship trend that is affecting adult VN titles like Mila AI.
I looked into it. I don't think those issues are what affected this game, which fell afoul of patreon's R18 AI policy. It prohibits "realistic" ai depictions except in cases where it's a real, consenting person, to avoid legal culpability and bad press for deepfakes. aDDont let their style stray too close to realism and got slapped for it. They also explicitly ban for giving tutorials on how to create realistic r18 ai content, which aDDont seems to have done.
From what I found, Ackman wasn't the start of it at all. The porn industry has been dancing with the payment processor's (PP) esoteric rules for decades before he came on the scene. Rather in 2020, on a whim, he got upset while reading a just published article about the rape and illegal content on pornhub and was merely a catalyst for its purging, and to be fair those were really big fucking issues. Perhaps deserving partial credit for sparking the unwanted attention that drove pornhub's purge, but that article also received widespread press.
Seems the motivation of the PP's is merely avoiding public scrutiny involving things most people find unconscionable, hence why they didn't act against pornhub until it was all over the news (remember, when the average non-gooner hears about incest, rape, or bestiality, they don't think "huh that's not a fetish I'm into," they think "wtf they should die!"). In addition to the chargeback issues that have put them at odds with the adult industry since at least the 1970s.
This has been brewing for a while. PPs either don't care to distinguish between drawn and real life depictions, or they simply don't trust the court of public opinion to differentiate (fair enough people are wilful and stupid). Easier to just slap them all. It's for the best that this transitions to subscribestar. If that site censors under pressure, move on to the next.