Or maybe to appease people who aren't into those kind of fetishes? I and many others do like what you call "boring vanilla". I could go on about your incest or loli fetish, or rather content involving minors as that's what it really is, no? But to each their own I guess.
I liked the boring vanilla too at some point, after 5 years it gets, well, boring. That kind of content is literally free everywhere, there's no need to go to Patreon and pay people to make more of it. That's like Eskimos going to a gas station in Anchorage AK to buy a bag of ice. As far as appeasing people, it's simple, including everything but make it all optional. Don't like lewd lolis? No problem, just don't apply the patch or simply choose not to groom the lolis when meeting them (SS doesn't need decensor patches). Same for any other kink: don't like scat = then choose to refuse to eat an LI's shit or don't shit in her mouth when she offers or asks, don't like beastiality = don't agree to have a threesome with an LI's dog and don't give her permission to fuck it when you're not there either, don't like NTR = then don't put your Li's in questionable situations with other dudes or another girl they are crushing on/getting crushed on by, etc. It's not brain surgery and usually pretty intuitive for the successful AVNs on SS with every kink imaginable. Some simply have checkboxes for kinks to include/not include in the options menu.