itch.io

There isn't really a generic "go to the government" option. The options are either a. Take Visa to court or b. lobby congress to pass regulation. Both of these actions are fueled by money, and Itch doesn't have any of note. They can "barely keep the lights on", figuratively. Ross's Stop Killing Games initiative only cleared its petition goal due to a well-timed miracle, and that was at attempt to act on a massive systemic defrauding of consumers across the whole industry for a decade or more now. No one is going to care, on a broad scale, about itch being shitty to a few of their customers property rights. Now of course in theory you could sue ITCH, rather than Visa, but again, kinda blood from a stone. Not worth it even if you could win.
Personally, MY armchair lawyering angle is that a case could be made for tortious interference, against Collective Shout and possibly dragging Visa into it. Interfering in a contract basically. But again, that would require money. Lots and lots of money, that Itch doesn't have, and that the creators effected certainly don't have.