A business deciding how its facilities are used isn't censorship. If I go to a movie theater, buy a ticket, and then start shouting at the audience about how Jews control Hollywood, they'll throw me out. If I mail a dick pic to the newspaper and demand they publish it, they will not. Are you saying these things are censorship? Certainly, they're about businesses limiting "free speech".

To use a closer analogy, Tumblr recently banned "adult content", including nudity. This affected friends of mine. Is that censorship?

Ok, so why can Patreon not decide what is and is not an acceptable use of its platform?

Sure, fine, let’s look at it that way. But then we have to accept that these businesses are responsible for everything they allow. We can hold them responsible for any copyright violations and defamation they carry since according to you they ‘decided it was acceptable use’.