Ever since abandoning ship I’ve maintained a negative (1 star) review every time there is an update for the app. My review contained no swearing or anything else that I think would break a rule.
This morning I went to update and found my review gone, and trying to submit a new one fails with a “Server error”. I was able to review other apps.
That’s a kludge which they only tolerate because not many people are doing it - if it were really that simple then most apps would have continued development and just made each user paste in their own key at first launch. (With instructions to generate it of course) But that’s not what happened.