The phenomenon of YouTube fandom having its own ideas of who "owns" music regardless of what the performers say is common enough with Irish music buffs, but gets MUCH MUCH nastier in south-east Europe or the Caucasus. If you look at the comments to just about any song poular enough to have crossed a few national borders, you can learn how to say "your mother wears army boots" in Greek, Turkish, Albanian, Armenian, Azeri, Kurdish, Hungarian, Arabic and half a dozen Slavic languages.

There is a fabulous documentary about one instance of the process:

Whose Is This Song?

That film maker has guts.