unfortunately, now the only choice for getting online content out there that is controversial in any politically charged way is to advocate hard for the indie web and to uplift and seek out developers/creators who host their own content. this wont solve the payment card company problem, but it at least somewhat circumvents the issue of having tons of useful, beautiful, diverse art disappear overnight and never be seen again. the indie web is out there and it's beautiful, though imperfect. we all have the power to shape it if enough people give a damn about protecting art. if you have content (hate that word, sorry) from itch.io that got taken down that you don't mind giving out for free, consider making a website!
obviously easier said than done. it wont be the same. likely, nothing will return to the way it was, at least not here. but efforts can be made to at least preserve culture. i used to recommend this website to anyone looking for off-kilter, exciting, fresh art. this is not just the home of thousands of games, but of animations, books, comics... this was a home for me. i regret that i didn't archive every little thing i happened upon. safe havens don't last when these companies get involved.
your art is worth keeping alive out here! make a neocities! use templates! scream everywhere at the top of your lungs that you exist and your creations deserve to take space! don't let anyone tell you otherwise. (not to say this is your responsibility to fix this. no individual can fix this. i do grieve with you.)
to creators who had their livelyhoods destroyed overnight: i'm sorry. i bought so many of your books and games, but i wish i could have done more. all i can do is sign petitions and advocate as annoyingly loud as possible.
if a creator makes something that resonates with you, even if its something unsavory or politically challenging or "cringe", don't hide your appreciation if you loved it. be less afraid to rock the boat. NSFW content is value-neutral in a vacuum, and isn't inherently bad or good. celebrate the NSFW stuff you enjoy, because it will disappear before you know it.
the only way we will see change is through systemic change, but that can start with you and your artist friends making groups that support another. join a union! create a union! tell your friends "hey, your weird cringe furry yaoi robo-NSFW stuff should be plastered everywhere it ethically can be!" and then spread that stuff around when it's posted. we've all witnessed the rise of word of mouth when it comes to indie games. a single recommendation + a website with a dropbox link = your art in someone's hands. that's worth a billion call of dutys and fortnites.
MAKE! WEIRD! STUFF! FOREVER!