Here's their operating model, which sounds like a mix of paid brand manager subscriptions and advertising: https://support.productreview.com.au/hc/en-us/articles/36000...
lol. the current amazon scam is to purchase the product (ship to a random address to defeat “common address” detection) then leave the fake review
for amazon the receipt is guaranteed authentic as the product will have been verifiably purchased on amazon. for a 3p site receipts can be trivially fabricated
I'm wondering as there are quite a handful of fake receipt generators on the internet
Of course misbehaving companies would probably stop spending there, but that might not be a bad thing.
It is possible to exist in this space with a potential conflict, as long as you position yourself appropriately. If your interest is to serve "decent" companies by providing them with interested candidates, it can work.
It'll work fine until the site decides chasing profit is more important than integrity of the system, so probably right around the time they're looking for more funding.