These?

https://www.coingecko.com/en/coins/cardano#ratings

They are provided by TokenInsight, which can be paid to give a project some extra points and biased view. Better to do your own research.

Thank you. That's what I feared.

As a follow up - "how" does one do research? All I can think of is

to do a google - strike that, DDG search on the exchange looking for complaints
ask around on forums such as this.

Do you have a list of sites that review exchanges which you trust?