Seeing how many developers that use the step-family roles have been on Patreon for many years now without problems and it's mostly those that use blood-family that are taken down, DPC has a pretty decent chance that Patreon will let it slip if foster family engage in sexual acts with eachother.
I'm also pretty sure that most patrons (except for sleepers) would follow him to Subscribestar if he decided to go there. To be honest, I'm surprised he didn't also open an account there but then again, I don't know how much their fee is compared to Patreon.
But yeah, DPC seems to rather seek out the limits of his playerbase rather than the monetization platform he's on.