1.) Massachusetts recently passed a law significantly limiting non-competes
2.) I've never been able to find specific numbers, but my experience in Massachusetts is that they're far from universal. I've only had one in my career and that one was quite narrow. (That was EMC which was one of the local employers who fought hardest against the weakening of non-competes.)
I don't like non-competes and personally think the new law should have been stronger than it was. But, historically people jumped around employers like the Route 128 computer companies all the time.