Have to say Pom, I think you started something that could be the start of something BIG!
This might be a little more scummy this might work, but it's not just NSFW and SWrs artists getting screwed over their Payment processors, it's also NRA and Legal Cannabis companies and right-wing grifters that are getting screwed. If you can or find a way, perhaps find a way to contact these other groups that are getting screwed over. the chances of victory are even greater. If you could make this payment processor discrimination a wide-ranging thats affect alot of things. Courts would start to take it more seriously and would make it harder for prude groups and Religious orgs to fight it.