More often than not people have a vested interest in advocating for free speech. In this case, that interest is obvious; Kim Dotcom is facing criminal charges for facilitating copyright infringement, and is trying to characterize the issue as one of free speech.

He's trying to lump the Megaupload takedown alongside SOPA, PIPA, etc. to ride the wave of discontent that challenged those pieces of legislation.

It's cynical and insincere.