What Plex's terms say
Plex's terms of service and privacy policy have 13 rated points: 0 serious, 5 bad, 4 worth knowing and 4 good. 9 apply whenever you use the site, signed in or not; 4 only once you have an account.
Whenever you use Plex
Bad 4
You are tracked via web beacons, tracking pixels, browser fingerprinting, and/or device fingerprinting
The service may use tracking pixels, web beacons, browser fingerprinting, and/or device fingerprinting on users.
Where it says this ↗Your personal data is used to employ targeted third-party advertising
The service uses your personal data to employ targeted third-party advertising
Where it says this ↗Information is gathered about you through third parties
This service use third-party analytics technologies such as Google Analytics
The "Tracking Technologies" page says that "We also use analytics technologies, such as Google Analytics"
Where it says this ↗You waive your right to a class action
You waive your right to a class action.
Docbot
Where it says this ↗
Worth knowing 3
There is a date of the last update of the agreements
There is a date of the last update of the terms
Where it says this ↗The court of law governing the terms is in location X
Where it says this ↗You agree not to use the service for illegal purposes
Users agree not to use the service for illegal purposes
Where it says this ↗
Good 2
You can request access, correction and/or deletion of your data
You can request access and deletion of personal data
Where it says this ↗Logs are deleted after a finite period of time
User logs are deleted after a finite period of time
Where it says this ↗
If you have a Plex account
Bad 1
Tracking pixels are used in service-to-user communication
According to their Tracking Technologies page, Plex "may place a pixel in HTML-based emails to let us know which emails recipients have opened"
Where it says this ↗
Worth knowing 1
This service is only available to users over a certain age
This service is only available to users of a certain age
Where it says this ↗
Good 2
You can opt out of receiving promotional communications
You can opt out of promotional communications
Where it says this ↗You can delete your content from this service
Where it says this ↗
The documents
Ratings by ToS;DR volunteers; they can lag behind the current terms. Not legal advice.