People like doing business with those they know, trust, have worked with before, etc, etc.. and major corps recruit heavily from one another. It's quite common

People like doing business with those they know, trust, have worked with before, etc, etc.. and major corps recruit heavily from one another. It's quite common for someone to jump ship and then turn around and do business (or even just recommend) their old company for something. That's part of the reason burning bridges is such a horrible idea.. because it's a small world after all. It's a small, small world.