Not generally about the policy, but there is one famous instance I'm aware of: Sargon of Akkad. It was something to the effect of him calling the neo-Nazis the N-word on someone else's Youtube channel. To be clear, he used the slur AGAINST the neo-nazis. Then Patreon dumped him. Here's the first Google result I found about it, no guarantees of accuracy.
https://heavy.com/news/2018/12/patreon-sargon-of-akkad-jorda...