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Survivorship bias: The people who can leave comments on the message board are always in the minority! To give a simple example, among 100 customers at a restaurant, one person thinks today's food is a bit salty, so he writes down this opinion! The owner, in order to accommodate this opinion, reduces the amount of salt, and as a result, 99% of the people think it is bland! In fact, it is not that 99% think it is bland, but that 100% of the people think it is bland! Because the person who wrote the opinion is very likely to never visit this unsatisfactory restaurant again! Only those who have no opinion are left to bear the consequences of this reform!