I too have the lifetime pass. A group of us collectively manages >1PB of content via Plex. But we need an offramp to derisk enshittification, and Jellyfin is that readiness capability. If you have no option to switch to when the time comes, you are SOL. Even if I did not use Jellyfin today (I do for a music catalog, but it is not primary), I am willing to provide them recurring donations to make sure they are ready when I need them.

(ymmv, I work in risk management, a component of which is vendor risk management, so the professional mental model gets applied to home systems when applicable; rug pull? not on my watch, and the rug pull will happen eventually)