My SO has lots of experience working in businesses selling stuff on-line and while negative comments "out of spite" happened rarely to her, what she often told about is how dishonest employers made workers bribe people so that they cancel/remove their negative reviews. Hearing the stories that I did from her, I no longer treat lack of negative ratings / reviews as a strong quality signal.
EDIT: Oh, and speaking of Amazon, Google and their automated bans, my SO's company's work account got temporarily blocked by Google recently, apparently for the sin of sending several files in quick succession to her boss' account. Apparently "atypical usage" is grounds for a ban now. Fortunately, the account was unlocked few hours later, and I didn't have to make fuss about it here on HN...
That's a false premise, which assumes any and all complaints are made in good faith. Some people are assholes and will leave a bad review because they disliked the person who delivered a meal or any number of other spurious reasons. You really sound like the sort of person who has never worked in any other field than IT and has a naive and largely illusory view of business conditions.