ddosforhire.net
They're a lovely recommendation/review site that lists a few dozen DDoS-for-hire sites. Take a random look at who hosts the individual sites' DNS.
Their business is fundamentally a shake-down racket, disguised as a free-speech defender.
Again, this isn't free speech -- it is the antithesis of free speech. That's called hypocrisy.
And yes, of course they cooperate with the FBI on specific cases (or, at least one specific case) of DDoS-for-hire prosecution. Not only because they are compelled to do so by law, but because they are the only company that can identify where the perpetrators are actually hosted.