Google has routinely removed respectful, factual, but low-rated reviews I've left for restaurants and other places just because someone complained. They have also cleaned up or disabled reviews for many public institutions in some (or all?) countries. Then there are cases like Germany, where even a 3-star review may be automatically removed because it's considered potentially defamatory.
I understand that ICE is a very contentious topic but this seems to happen quite often in other situations as well. It's made me value Google Maps reviews much less.