You can self host a server on your machine, and buy a license for it. Not all software you run on your own machine has to be open source. See: Plex for example.

> Not all software you run on your own machine has to be open source.

You can take that risk if you want to. I prefer to not make myself dependent on a single vendor whenever possible.

I'm not super familiar, but it looks like you're subscribing to Roon's metadata but it's "bring your own music" (to quote their FAQ) which can be files you self-host and/or supported music streaming services (which don't include Roon) that you subscribe to separately.