Text:
I consent to Plex to: (i) sell certain personal information (hashed emails, advertising identifiers) to third-parties for advertising and marketing purposes; and (ii) store and/or access certain personal information (advertising identifiers, IP address, content being watched) on my device(s) and share that information with Plex’s advertising partners. This data is used to deliver personalised ads and content, ad and content measurement, audience insights and product development. Your consent applies to all devices on which you have Plex installed. You can withdraw your consent at any time in Account Settings or using this page.
Soure: https://www.plex.tv/vendors/ (Might have to clear cache)
Can also read about the changes here: https://www.plex.tv/about/privacy-legal/
I have no skin in this game, but IPs are definitely not anonymous data. Also there is a lot of great info out there about de-anonymizing seemingly random data. Interestingly enough, this is similar to the Netflix prize dataset that was one of the more famous ones. Maybe a good introduction to that would be https://www.schneier.com/blog/archives/2007/12/anonymity_and_t_2.html