lots of examples of fake reviews on goods that show up in common search results:

e.g. https://www.amazon.ca/Bluetooth-Headphones-Sweatproof-Compat...

clicking through on a reviewer shows, for example, an account with 82 5-star reviews, all posted today, April 15th:

https://www.amazon.ca/gp/profile/amzn1.account.AFZWITCLSKYQH...

Seems like posting 82 5-star reviews in a single day should probably trigger some sort of anti-fraud mechanism?