But that's not true at all, @Petra202 . Reviews are posted 14 days after the stay whether or not the other party reviews. Within that 14 days, they are not posted until the other party posts, but once the 14 days are over, the reviews go up regardless.
There are guests who have used Airbnb who have no reviews, but that will be because the host did not review them, or because a review was taken down for a violation. Sometimes a guest will close an old account and start a new one, but that is harder than it sounds. I have had guests try to do it with no success.
Anyway, the thing you are worried about is not a thing that happens.