Second, Trustpilot review can be bought or manipulated, and only review provided by platform let like Casino guru, Ask gamblers can be trusted. According to what I see they have average score which is still a good review.
Trustpilot scores can be manipulated by buying (or incentivizing) positive reviews; however, I have yet to see fake 1-star reviews. In my opinion, most, if not all, of those are genuine.
However, I strongly disagree that CasinoGuru or AskGamblers scores can be trusted either. Their reviews usually contain at least some inaccuracies, and the base score they give to newly added casinos on their site is misleadingly positive.
CasinoGuru, for example, scores newly added casinos with a 7/10 safety rating, well above average, and it takes an insane amount of complaints and time before they start to correct the score. A casino that stole thousands of dollars without ever providing a basis for it was rated "above average" for over a year, until they finally decided to lower the safety score to "low". The same happened with an actual scam casino, it had an "above average" rating for over a year, until the score was finally corrected to "very low."
AskGamblers is less likely to feature scam or dishonest casinos; however, their scores, like Trustpilot's, are much more susceptible to manipulation by fake or incentivized reviews.
Then you still need to do your homework.
There's no way you can verify Trustpilot review to be genuine and if you work in the marketing space you which I have once did for a project with their Trustpilot you'll know what why I prioritize CasinoGuru and Ask gamblers which are platform that stands for gamblers over Trustpilot.