A blogger in Taiwan was jailed for criticizing the food she ate in a restaurant.
It is very hard to speak with the precision that this court punished her for failing to use. I try to do so, but I don't always succeed. However, even if she carelessly stretched her statement, that does not justify imprisonment.
It appears that online reviews create psychological pressure to exaggerate.
If we would like to discourage exaggeration, harsh punishments against a few of those who succumb to this pressure will not do the job (in addition to being unjust). Changing the structure of the system might perhaps work.