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/
Right. Personally I don't stream and only access my library from my TV at home. So Kodi is all I need for now. Though I'd like to try Jellyfin one day when I don't have so much other stuff to do. I actually don't know what exactly I'm missing out on.
If you want to sync watched state, resume position, that sort of stuff outside of your house, Jellyfin would be a good tool for that. And it integrates seamlessly into Kodi. Plex unfortunately doesn't, you have to launch an addon from Kodi, so it's not as nice.