Itch is indie itself. They act very unprofessional about a lot of things. I doubt they have a large legal department or any means to fight back. They are "weak". And there might be non disclosure agreements that they cannot breach. Pissing on their payment processors by leaking documents is not a smart move, if you want to keep your little indie game platform running.
From my perspective this is all so very unnecesary. Be it those bigot activists scaring facebook mums or the credit card companies being virtue signallers abusing their defacto monopoly. It is so pointless, because they stirr up this nonsense about fictional content. Especially the credit card companies should be ashamed, because they profit from actual real porn big time.
They are not fighting any evils or doing any good, making the world better or anything.
But bashing on indie adult video games is easy. The easy fight. It is a smallish subculture, unlikely to fight back effectively. Easy win for the activists, easy virtue signal for the credit card companies.