I'm sure like everything else there are various opinions on this, at least I haven't found anything definitive. Curious what you randos think.
I read in some presentation (can't remember the author) that spectrum rights would just be like land rights: the first person to broadcast on a frequency (appropriate the frequency) over a specific area has claimed stake on that frequency and owns it until abandoned/transferred. I see many limitations to that approach, technical and practical.
make your own licenses and let a neutral third party who's making better use of it until the licenses are done away with it altogether. think HAM radio in mexico—many people use it, and it's not an issue. it's already similar with trucker CB frequencies