The only one missing from that list is Microsoft, wonder why... and youtube == google.
FTA: "Notably missing from the defendants' list are Microsoft, in which Mr. Allen remains a major investor"
Wonder if microsoft has a deal with Allen or if he just doesn't want to sue the company he has a stake in.
This could easily be spun as Allen as the attack dog against microsofts competition.
He's not suing microsoft because he'd be shooting himself in the foot. He might have a deal with them to license it, or he may just be letting it slide (he can always sue them later). Same with google.
He's under no obligation to enforce his patents - it's up to him.