Couldn't they have switched to another payment processor?
That is looking more and more like a short term to non-viable solution. They are all going along with this, and no one new is stepping in to offer options that don't stomp the 1A.
I'm absolutely expecting at least one of my CCs to no longer do business with "gun businesses" any time now. I'm pretty sure all three of my cards are owned by commie megacorps.