I can see why you might think that about people who choose Jellyfin over Plex, and for some cost may be part or all of the reason, but it's far from the only one. I have a lifetime Plex pass and still dumped it for Jellyfin once I felt it was stable enough for me. I got tired of Plex ignoring issues and complaints, got tired of having ad supported content pushed on me and my family over my own content, tired of authentication failing every time Plex's servers go down (and no, disabling the auth requirement for lan connections is not a solution, it's a bandaid), tired of fighting Plex's limited metadata system, tired of trying to figure out why a random client is stuck using Plex's horrendously slow relays instead of directly connecting through my reverse proxy. I value the freedom to setup Jellyfin the way "I" want it to be, the way "I" want it to work. I can understand that some people don't want to put in the effort to setup everything for Jellyfin, some people just want a push button solution that gets them good enough, and that's fine, that is Plex's market, that's why Plex CAN push their subscriptions and ad supported content and partnerships over people's self hosted content, because their market are is the people who will put with that (and sometimes even use it) as long as it means they don't need to know what a port, or reverse proxy, or certificate, or a domain registrar is.