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Actually that’s probably not correct. Plex‘ terms of use are catering to private users and forbid a commercial use.
Plex Pass isn’t limited to a single platform. I guess you’re referring to the one-time purchase you can do to unlock/activate the mobile apps (in case you don’t have a Plex Pass).
Not sure I fully understood what you’re aiming for…but this seems to be again about using Plex in a commercial setting which is specifically against their terms of use.