Well I dont share it with anyone if I download from Youtube. Like in Piratebay with the torrents files, so it's for my personal use.
Almost same like if I had a radio and would record/play in the music in the included tape recorder in the radio device.
I could play it in with the microphe from Youtube also and save it. And it's a program that you could use in the computer for that:http://en.wikipedia.org/wiki/Audacity
In the old days we borrowed LP from friends and copy them to a tape to. So this will always be a problem for the music companies.
But can they ever stop it? I not think so.
I suppose the artists make more money on tours, conserts sell stuff like T-shirts and so on nowadays. But I like Youtube because they have a lot there from not active groups. Slade, Uriah Heep etc..