It is part of the issue it tries to solve. If you check any popular platform with reviews, you will find lots of fake profiles leaving 5 stars with generic AI-generated comments.

Although we can't stop companies from "buying" a better rating, we can make it harder by making them spend resources to do so.

Also, the fact that it is built on nostr introduces reputation into the equation as well, you can easily verify the profile's past activity and history to determine the veracity of the reviewer.

aftermath

This isn't necessarily the problem you are trying to solve, but have you thought about a solution to self-zapped reviews? (for instance, a seller backs their own reviews of their own products)?