Easy. He just doesn’t care. Money from Patreon is still coming in. He wins regardless. People should stop supporting him at this point in order to actually perhaps make him care. There’s so many alternatives nowadays to his work. Katalist, A New Life in Submission, all showing more passion and efforts than Deka has ever shown in his three games combined. Sure these games aren’t perfect and could use some more polish, but at least they have people making them that cares.
Unfortunately the games that go into full out toilet service are much rarer then generic femdom games, and predominantly focused on foot fetish, which really is so vanilla it shouldn't even be considered a fetish.
I dropped Deka's patreon months ago. So far... it's just saved me money. The only other content-specific patreons I follow are Salia Coel (Who's also starting to run into a rather long time without content-specific release), and volbells. Though I'm probably going to drop the second due to his femdom drifting further and further into outright misandry.
The thing I liked about Domina, is that you, the player, had AGENCY. You could fight against the dominas attempts to enslave you, beat them, break their seal, move on. Some you could even come back to just to have a good time after (Narcissa) though that was likely a bug rather then a feature. Hell, most of the dominas give you some grudging and subtle respect for being where you are, and getting as far as you have.
Most femdom games don't give you that agency. You are stuck on apath that is completely pathetic, generally despised by all the female characters, and you can't even pretend to have a backbone.
Domina was more in the battlefuck genre, you battle, and if you lose you get a scene or scenario, then a non-standard game over. Nobody plays battlefuck games with the intent of never being defeated (Well I may have tried a paladin playthrough of CoC once...). Unfortunately, being essentially a VN just int he RPGM engine means MHC is unlikely to have that.
Personally if I was to make a VN/RPG game that didn't go with the battlefuck genre, I'd be abusing the fuck out of non-standard game overs. Don't just... force the player to be a subsive little piece of useless meat, instead give an option of what to say, and if he refuses to follow the game plot, present a non-standard game over. "You choose to distance yourself from crazy bitch X, and the rest of your college time is fairly uneventful. GAME OVER".
Wow ok, I went on a rant that took off on a tangent. Back to my previous point, while femdom games are a dime a dozen, decent ones with acceptable writing and good art are much rarer. Ones that aren't afraid to dive into the deep end with toilet fetishism are practically nonexistent.