Furthermore you have to consider the non-binary nature of being demonetized. Youtube may demonetize only 50% of your videos, leaving your channel active but severely impacting the predictability of your income. Patreon provides stability and therefore a sense of security that creators are desperately looking for. You might lose significant income seemingly at random because your neighbor turned up their radio a little bit too loud and triggered ContentID, but so far Patreon isn't taking away creators' income for chickenshit stuff like that.