Not a bad idea but just in case the culprits decided to spin the text. Then that anti plagiarism tool may not work well. I don't know if it's practical but maybe you could also put in a mechanism to determine the weight of a review depending on the age of the account, number of other reviews among other factors

Maybe you should put up much more strict rules regarding reviews if you are going to majorly relay on them. Having multiple emails even if they are not throw away emails is quite easy. For example there are services that provide temporary verifications for Gmail account using very many phone numbers. Some charge $0.1 per verification number. So someone can even have over 100 verified Gmail accounts for just $10

And trust me, scammers or exchanges that fake volume can do anything to keep up their reviews faked too. It will be an even easier job for them as compared to faking volume. Just look at how messed up trustpilot is.

Exactly also their thread doesn't look professional at all.

@OP Add more information & try to make the thread neat & clean if you want us to follow this project.

Just checked out the website and you are using the same metrics for ranking exchanges that made coinmarketcap unpopular among some crypto enthusiasts.
Looking at you rankings by trade volume i didn't know 4/5 exchanges existed until today. The fifth one, bitforex has also known to fake trading volume and also scamming some people.
So how are you going to convince people to trust you ranking list that is full of scam exchanges?

Apart from the highlighted part, what other measurements are in place to combat against other creative ways that some of these scam exchanges do to take advantage of such platforms?
^{- Care to share your criteria for considering a review as a shill or spam?}