I think people want to be mad and don't care why they are. Hell, people are getting worried about lgbtq and queerness in general is gonna be treated, and while that is a valid concern, it is completely irrelevant as "The content in question likely includes incest, r*pe and other legally questionable content" Not anything about fellow gays. people just want to panic and riot since the world is shit and if something is a threat then it's "going to be worse eventually" and it might, but if people stopped panicking and had a clearer mind, they could find a solution instead of whining about it. Also it's not about itch being a bitch, it's about these companies wanting a monopoly on people's lives.
edit: it says in the itch.io post that the guidelines are from the payment processers linked to the account (if your money goes through one of these processers, you have to follow the processers rules to ensure you are getting monetized) and itch has nothing to do with those. Itch is trying to keep people making money without trying to piss off the people who enforces the rules, even if this includes free games. Itch has people and families, steam has people, those companies enforcing this never had people.