The assumption is that someone will come along and develop a frontend that ravages their bandwidth? provides convenient access to the hosted files.
Of course they will.
Providing access to copyrighted content without a license is indeed illegal.
No it is not. If it was, these apps would be gone as soon as they went up. Shit, if that was the case your browser would be illegal. Hosting the files is illegal, and I said said before, I'm not sure how AA gets away with that.
But we're explicitly not talking about torrenting.
LOL we're talking about software that facilitates access to copyrighted content. It doesn't matter if it's torrented or not. Is that why you seem confused?
then we're back to my original comment about how music players already exist.
You do realize you can stream torrent files?