There is no need to get a review rating from an online platform when you can make some research about the casino and see players feedback then make your judgement from there.
You are right. As the review site manipulate feedback of scam site by taking payment from the scammer (so called gambling site), there is no benefit of checking the review from the review sites. Hence we should research first but if anyone check about a gambling site on the forum or ask about the gambling site on the forum then the person (user) will not get any bad experience.