Unless they changed it, having Plex Pass on the account that manages the server “blesses” that server, unlocking all Plex Pass features for everyone using that particular server.
An example of this is sunsetting Plex Sync and replacing it with Plex Downloads.
At the time they used the whole 'Sync never worked right' argument to justify why they got rid of it.
In reality, Plex sync used to allow any user to download videos from any server where the server owner had plex pass.
Now with downlods, the user must have Plex Pass to download anything.