It seems Patreon has some new community guidelines.
Prohibited content now includes; graphic violence, bestiality, incest, rape/non-consensual sex, exploitation of children, and so on. They are extending these restrictions to art forms, including CGI imagery. That means video game content, which would fall under "illustrated, animated, and otherwise" from the new guidelines.
These new guidelines go beyond the 'flagging' system already in place for adult content. The new prohibited content is just that; prohibited from the Patreon community. And the process of account suspensions has already started.