I don't want to get into this after this because I don't want to shit things up with the worst possible combination of REEEEEya and incest, but first of all, racism—despicable though it may be—is technically legal. You can be a racist. People are. It's a perfectly normal character flaw, and even if you don't like it, that's just a statement of fact. Riya's content just takes that and the fact that it's a taboo and turns it into a kink. She's also one character in a vast pool and isn't even that expansive. In addition, her content is incredibly clear that she is, in fact, a parody. Her lines are incredibly over-the-top.How does that not also apply to incest?
Incest is straight up illegal. While patreon has made the awful choice of getting to define what's "artistic" and what's not, we have to deal with it. I don't like that they're hard blocking certain types of text-based or drawn porn any more than the next guy, but fact of the matter is that there was practically a novel's worth of nuclear incest, which is explicitly what they banned (primarily parent+child but siblingcest is sketchy).
Also, double standards exist. Get used to it.