OP is the only person I know who would go to the casino review site first, read reviews, and then join the casino to bet.
Over the years of signing up and getting out, most of the online casino players just shoot to ask questions in the forum which is a better casino and simply trusts the user's reply as to which one is better. A casino with scam accusations is often scratch out of the list.
Exactly what it is. Those review sites are even trying to earn through the referral link apart from the fee provided by the casino that demanded positive reviews to their review site.
If they saw in their feed about a bitcoin casino, just try googling them and maybe append bitcointalk on google search like "casineos.com bitcointalk" because if you find numerous accusation thread about the casino and sees they are not resolved, you'd best look for another because that accusation is likley real especially if it does have screenshot evidence.
Another is to look also in reddit, there's a plenty discussion there about gambling platforms and cryptocurrency, those who got a lot of upvotes will serve as assurance that the review or content is legit.
Most of the news/review platforms are paid so it's not 100% safe to rely on such platforms that accept money just to give good review.