I am aware that a few P2P sites may (possibly) not consist mainly/entirely of stolen material ... but I tend to take the view that if it looks like a duck & quacks like a duck it's probably a ... duck.
these sites are usually one step ahead of the isps, and once blocked using one particular domain name, pop up with another - either containing the word "proxy" or "mirror" or with a variation on their name. if you're determined, a little googling will find an unblocked domain name.