Often this idea that "it's their business, so it's their rules" is trotted out, which while of course being technically correct works to shut down any kind of critique of the state of affairs. People rightly or wrongly, depend on such platforms for their livelihood, and it's a shame that, as eurg wrote, nothing happens because it's a niche problem. It doesn't affect the "good guys", because we value their craft more than other crafts.
But it comes down to this - I realise that if I ever wanted to monetise my own artistry, I'd have to use Patreon, and the limitation of what I can post (be that adult content, even the more "disgusting" kinds involving incest or bestiality as they mention) means that my creative output is limited. As such, what I can spend my time on is not only restricted by "the market", but also by Patreon, also by Visa, also by PayPal, also by Mastercard etc. I become self-censored, chilling effects.