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'll say that not having to do that is a major postiive. One of the UX things that bounced me off of jellyfin was ending up with a reconfigured library. The correct UX choice is for the software to adapt to your preexisting library, not having to rebuild it all with a different set of information files and naming conventions.
That is a BIG deal when you have a big library. Also why I hate Calibre. Screw Calibre.