Earlier quoted context omitted.
Patreon went one step further - if you post content against Patreon's rules anywhere else, even if you don't link to it, if Patreon finds out, they'll ask you to stop doing it, and threaten to suspend your account if you keep doing it. This is why many people who post fetish-y art (even stuff like mind-control kink) moved from Patreon to SubscribeStar. Even erotic roleplay site F-List moved to SubscribeStar.
Patreon went one step further - if you post content against Patreon's rules anywhere else, even if you don't link to it, if Patreon finds out, they'll ask you to stop doing it, and threaten to suspend your account if you keep doing it. That sounds outrageous. Is there a link to more info about this policy?
>Because you are raising funds on Patreon, we may be held accountable for what you do with those funds, so we may also look at what you do with your membership off our platform. As a result when we talk about “On Patreon,” it means the creations you are funding on and through Patreon. When reviewing a page, we look at how creations are shared, where the page is linked to and where the traffic comes from. No matter what happens, we always give creators the opportunity to appeal a decision by contacting us and sending any relevant information they believe was not considered. We may not change our minds, but we will always listen.
From: https://www.patreon.com/en-GB/policy/guidelines
This means that you only need to link to your Patreon, not even link from your Patreon for them to find you objectionabe.
About NSFW creators leaving the platform because of tighter content restrictions on fiction:
https://www.dailydot.com/irl/patreon-hypnosis-porn-ban-sexua...
https://thenextweb.com/news/patreon-continues-to-crack-down-...
Further, Patreon has communicated to artists that regardless of the age of a fictional character, certain art elements common to anime/manga style drawing (even of adults - "big head, big eyes, short height") may be considered as marking the artwork as a child - and even adding adult-like proportions such as large breasts may not be sufficient to evade Patreon's ban: https://twitter.com/Waero_Re/status/1238408555507539968
Another artist in the thread noted that Patreon decided their content was "violent" because their drawings featured people not smiling during orgasm.