There are many things to consider before making your choice of preferred casino and one of them is popularity too. A casino that is popular also portrays that they have a good reputation to an extent and that is because if they have a bad reputation the reverse will be the case as people would talk bad about them and they will have more bad reviews compared to if they are good.
For new gamblers who want to choose a casino for continuous gambling, maybe they can pay attention to the reputation and popularity of the casino. That is the best and easiest way for all gamblers to do when choosing a casino.
But I also often create new casino accounts, especially those registered on the forum. Just to get experience from some of the casinos on the forum. Of course, new casinos, don't have popularity and maybe a newly built reputation.
Another thing to consider is their customer support response and also how responsive their website or applications are. A poorly built application or website suggests that they are probably a scam to gather cash and disappear.
Customer support is one that I will always access to ask a few things when I am going to register a new casino. I am most unhappy when support is not available or is only limited for a certain time. Even some ask customers to wait for a reply email that is received for hours