This is the biggest problem for me. I have thousands of movies and 10s of thousands of TV episodes, but my audio library is still all the same stuff I downloaded from Napster, Limewire, Kazaa 20+ years ago. It's too hard to find a good selection these days outside of a few private trackers. I'm in several private trackers but I'm not going to sit in a queue for 2 days waiting for an interview time and jump through hoops to join something like RED or PTP tier tracker.
Not to mention I mostly listen to podcasts these days and when I do listen to music, I try to find new stuff that I've never heard of rather than searching for a known artist. This would be way too convoluted to do on my own with some self-hosted solution.