First of all, check the website name on search engines, and don't forget to add "scam" next to the brand name in order to find related articles/posts. There are many factors to choose the best casino that suits your requirements which can be completely different depending on the user's personal experience. BTW, you can check this thread and read the opinions of other forum members before making your decision:
https://bitcointalk.org/index.php?topic=5382430.0if you are outside the forum and let's say for example, you don't know the gambling board in this forum, you can indeed check it via google search. because if the are existing allegations or has history of scam accusations, you can easily see it. even trustpilot feedbacks are worth to read as some are legit reviews. however, if you are in doubt, you can always double check it with other references or sources like in this forum.
every gambler has their own preferences when it comes to their games, so this question is quite subjective as it depends on the player himself. but as much as possible, better choose a casino with less to no existing allegations. you are using your funds, so better secure it because no one will.
The problem with those reviews is that as we know anyone can say whatever they want on the Internet without any evidence backing their claims, and as such it is not rare at all to find a lot of reviews that are not really up to the standards that we see in the forum.
But in this forum if negative trust or a flag is to be left at the profile of a casino then evidence will need to be shown and the casino will be given an opportunity to answer to the allegations against it, so the reviews we see here in this forum carry a lot more weight than the ones we see elsewhere.