They block owed funding to existing creators who were not at all previously in violation of rules. They actively removed downloads of owned games. That alone is basis for several lawsuits, and across all the people affected good bloody luck with that.
They went far and beyond what was ever required of them and they will take a bigger hit than merely public perception yet.
Don't be surprised if they don't make it through. Not because of payment processors, but because of their own personal choices.
https://itch.io/docs/buying/already-bought use those instructions to try to help yourself