I also want to emphasize that relicensing from the GPLv2 to something proprietary is damn-near impossible for a project this large with a team who are so ideologically motivated to make FOSS. If I today submit a PR to the Jellyfin codebase, they can’t legally relicense to a proprietary license without 1) getting my consent to give me ownership of their work (I’m not likely to be paid off or convinced it’s a good thing that work I submitted for free is being enshittified), or 2) removing my work from the project if they can’t get in touch with me or if I say no. To emphasize: this process is affirmative.

Thus, the process is to survey who’s contributed to the project, reach out to anyone whose work is still in the project (preferably in writing in a permanent, court-admissable format like email), ask them to transfer ownership of their copyright to you, keep track of who’s said no, said yes, or not answered, fulfill conditions for anyone who wants something in return, and meticulously rip out all of the code from people who say “no” or don’t answer. One of the project’s major contributors died 10 years ago? Legally, too fucking bad: they didn’t relinquish shit to you. Rip out that legacy code and start over.

Just like for instance if you want to take a Wikipedia article and own it for yourself, you can’t just go ask the Wikimedia Foundation nicely. You have to contact every single contributor whose work is extant in that article, and rip out work that isn’t explicitly given to you by its owner.