Hmm, it's been a while, maybe I'm misremembering. There were definitely some categories of Plex content not from my library that kept reappearing on the home page of my server, despite trying to get rid of them a few times. Maybe they weren't actually paid, I just assumed they'd only be pushing something if it was going to bring them more revenue.
The other thing that made me want to jump ship extremely fast was when they started sharing your recently watched items with other users, without asking.