It's not the engineers making these decisions. They write the code they are told to write. Some middle manager / VP gets a promotion if they 'increase engagement', 'increase ad-spend', or some other hollow metric they chase. They are the ones deciding to send any 1-3 star ratings to customer support, and 4-5 ratings recorded as an actual rating. It's not about the users at all. It's about gaming the system for some manager's benefit.