yeah, when did Opeth say this?
Moreover, any underground band that held this view would be being stupid. For someone lke me, ie someone who listensto types of music different from their friends and wh has a limited budget, file sharing is pretty much the only way to check bands out. I can make a longlist of shit I never would have heard w/o file sharing.
I've aways assumed that one thing aout file sharing that pisses the mega-corporations off so much is that it takes away their near monopoly over the ability to get music heard.