Sadly there's more than enough people who see all of them as such.
But let's be honest, there is a lot of trash. I can't really talk about the mang games, because I really don't like them and don't look into them, but there's also many bad games with other art style.

But there are good ones, GOG added three of the ones which I consider to be among the best ones to their portfolio.
Other good ones have an ongoing development process and are neither completed nor split into publishable chapters/seasons, so they can't make it to GOG until that happens.

Surely a more appropriate response given we live in market economies would be to release a game of your own that addresses any of your perceived shortcomings in representation of fetishes activities or groups within the adult games on sale? I mean, you've already said that they're RPG Maker games using stock assets, so it shouldn't be that hard to do, and would probably be a better response than merely criticising the creative output of others. Let the market decide.

Plus, you could make some money. Stores like Itch will literally sell anything and if there's one thing that the last 20 years of Marvel films have taught us, it's that rehashing the same plot over and over again while asset swapping the characters does make an awful lot of money (even Oscar nods in the case of Black Panther)