My company is also a heavy user of WordPress and never have contributed. We also hide those widgets. Do we need to be blocked as well then?
so then the question becomes "Why is the Foundation/project hamstringing a competitor to their director's for profit company who is, in theory, and legally should be, independent?"
Suppose one of your developers writes on twitter that you don't permit contribution, and you fire that developer on the next day. What reaction do you expect from the people who pay for most of the development?
I'm guessing you are not size of WP Engine and Silver Lake, honest question, if you were, would you want to contribute back to WordPress?