The only difference between an anarchist rocker and other rockers are that the anarchist chooses not to buy into the system........ and even then it's not Universal, as the Beastie Boys, Johnny Rotten, David Byrne, Trent Reznor, Rob Zombie, all will quite amply prove.
Hip hop and rap artists who start out with an anti-establishment message avery bit as hardcore as punk rockers, and are also prone to selling out and entering the corporate world. Master P, Sug Knight, Snoop Dog and Sean Combs (or whatever the fuck they are calling themselves these days), Kanye West, Jay Zee...
It's not that learning the skills is any harder for them, its that most of them got famous as one trick ponies and lack the dedication or even interest in doing anything other than making the music. Rage Against the Machine simply does not care about anything but their music and their message...
The trick, which so few manage to accomplish, is how to make that anti-establishment message a viable profit earner... Beastie Boys managed to do this, but very few other punk rockers or rappers can maintain that level of integrity and still remain that influential or profitable.
I mean, Prince, Bono, and Madonna may never have been anti-establishment in anything more than the most self serving veneers, but they know how to make music (even if its not to your taste), they know how to sway a crowd, and they know how to make money... and while their messages may not be anti-establishment (which is in no way required to be a rockerboy, all that is required is that you actually HAVE a message beyond let's party and fuck), they have most definitely had their own messages and worked tirelessly to put them out.