I still have a folder of miscellaneous files obtained from Napster by simply searching "remix" every few days. Yes, the quality is very hit or miss, but many I've never come across again, even in years of clubbing, videos online, etc. For example, this wound up in my collection:
https://www.discogs.com/Stina-Nordenstam-People-Are-Strange/...
I found so many things back then, and during that time period my musical knowledge/familiarity grew three sizes.
Oftentimes it's old
there are lots of countries where you can not buy DRM free music from amazon (afaiu what the OP was referring to)
so the problem is how to find a shop where you can buy your super rare tracks ...
(i assume some will also be bootlegs or other fan-made recordings - you wont find those in a shop)
Yes, I know that fortunately there are many ways to pay for DRM-free music (I mentioned that I use Bandcamp pretty often). What I miss is the vast amount of content I had available 10 or 12 years ago; I have been able to buy a lot of music, but there is much more that just isn't available.
There are things that to this day I haven't been able to find on Bandcamp or on streaming services, including youtube, but which I was able to download during this small gilded age. Then again I weaned myself from streaming services (and from anything "as a service") years ago, so maybe things have changed. I also remember finding a lot of rarities in Soulseek when I had lucky days, but now there is far fewer people using it. In general direct download was so much better for this kind of content, because you only needed one contributor uploading it, and it was available for everyone. In P2P sharing you need much more luck to find someone seeding what you want.
I wish finding rare music was so easy in legal ways. I just want to download DRM-free albums and I will gladly pay (nowadays I buy a lot of music from Bandcamp), but in many cases that's not a possibility any more. I have also found myself in a case where music is available but not in my country. I remember a time when the only place where I found certain albums was in the german Amazon Music, but since I'm in Spain, I wasn't allowed to buy them. Gabe Newell is 100% right when he notes that piracy is a matter of convenience and not price.
Some parts of the internet have certainly got worse with time and this is one of them. Bah, get off my lawn.