RATM are not hypocrites at all, which is obviously what you're refering to. They're a band that obviously wants people to hear what they have to say (even if what they say has been told before, thats not the damn point), so being signed to Sony is not only NOT a problem, its a damn good thing they're signed to Sony.
Capitalism is a system that begs to be exploited, so exploiting it to preach against it is not hypocritical, its just a good logical way of gaining a platform. No one would have given a crap about Karl Marx if his work wasnt so well publicized, and thus there would be no cause for revolution.
Also their deeper tracks are hardly radio friendly. And most songs from the s/t debut clocked in over 5 minutes and were not commercial in structure. Oh my, their frontman screams a lot and kiRAB just happen to dig that, they're sooooooooooo commercial.