I once posted an article around here about 8-9 years ago citing this type of behavior as beneficial to obscure and underground artists, but some people wouldn't believe any of it lol.
I think after the heyday of Napster, the best place to find some hidden gems was Audiogalaxy for me. I remember downloading a track off their site by Msane called "Resurrection", and I would hold onto it for a brief period until I had a HD crash. Despite sharing the song with a handful people, I wasn't able to ever find it again. Meanwhile Audiogalaxy was shut down and watered down. My last hope was to contact Msane about it, and his response was the following lol: "man, i did that trac like in 98 and never used it. i sold it to a compilation in houston texas. i have a new album finished called " coast 2 coast hustlin "
featuring , bubba sparx, the nappy roots, jay tee, the de, balance and many more. " Yes, those were the days... and like with many others, those p2p file sharing programs revolutionized the industry. I would buy that song in a heartbeat if I saw it for sale but alas you can't even find a reference for it, let alone that it even existed.