I'll just say that I can think of plenty of examples where the same argument applies even more. You can say patients should be required to rate surgeons after a surgery, or a defendant his lawyer, or heck even voting--but our country does not have mandatory voting. Yes, for nearly everything in life more information is good, but what's not cool is requiring an user submit feedback. If there were a competing product in my city that does not require feedback, I will for sure use it to avoid the annoyance.