I thought this list was secret, how'd they find out?
Presumably their lawyers were able to rattle something out of one or more of the tech companies that banned them. Or they talked to someone on the inside ("Hey, I'll give you nudes if you tell me why I was banned" will succeed on 95% of BigTech workers).
These filters are only going to become more pervasive and abused more and more in the future. I'm not sure what the best solution is for this kind of thing, it's messy.