The problem is that Amazon likely has an incentive to keep fake reviews in that lots of positive fake reviews probably encourage buying. They may or may not be aware that they have this incentive, or they may believe that they don’t- but if fake positive reviews do encourage buying then they will find their way back to inferior content moderation.
Once you start looking you see this problem everywhere. Why is the Apple App Store absolutely crap? Why is the Google App Store even worse? Why is social media filled with astroturfing?
The problem isn’t just convincing fakes, the problem is also that the platforms have an alignment of incentive with the fakes. While removing fake reviews or fake outrage bait is a tractable problem, wanting to remove it is a harder problem- it just doesn’t make sense for platforms absent more competition.
Tl;dr:
Fakes/spam can prosper on platforms if they only harm the user and are helpful to the platform.
Once you start looking you see this problem everywhere. Why is the Apple App Store absolutely crap? Why is the Google App Store even worse? Why is social media filled with astroturfing?
The problem isn’t just convincing fakes, the problem is also that the platforms have an alignment of incentive with the fakes. While removing fake reviews or fake outrage bait is a tractable problem, wanting to remove it is a harder problem- it just doesn’t make sense for platforms absent more competition.
Tl;dr: Fakes/spam can prosper on platforms if they only harm the user and are helpful to the platform.