Fat-phobia is not a thing. No one is scared of fat people.
But most people, of all genders, orientations, or proclivities, do not find fat people sexually attractive.
This is a niche game for minority perverts, outside the majority, and that is fine, but should be made clear.
Trawling through hours of content with unattractive women, just for the sake of the few hot ones, only to find they are unfuckable, is a terrible thing.
Just tag the game as fat fetishist in nature and be done with it.