That's still a lot more finished product than the vast majority of Patreon devs.
If I look at completed ICSTOR games on F95 I see Taboo Request, Robot's Touch, Milf's Villa, Milf's Control and Incest Story 1&2. Even if one is basically a mini-game and 2 were rushed, that's plenty of content to suggest this would've gotten finished in some way.
I honestly thought Milfy City might be the culmination of his incest series, where he avoids all his past errors and implements everything he learned along the way... which he did for a while.
ICSTOR got popular because he's been riding the incest wave almost from the beginning and because he actually completed games, which is still far from the norm on Patreon.
As for work ethic, in my opinion the much bigger issue is Patreon's system, which rewards you for dragging on as long as your paying audience will tolerate it. Not only that, you actually need to start working on your next project long before your current one finishes. Otherwise you have nothing to offer for months and your pledges drop, possibly permanently, no matter how committed you are.