What are the grounds that you have considered in ranking these sites? However, I could see an accuracy but we have different perspectives. There are sites where we're comfortable using yet they're listed on the lower rank. The good thing is, most of the gambling sites that I'm currently using are listed on the top 15.
He mentioned that the ranks are based on traffic and popularity so it doesn't necessarily mean that the website that's on top of the list is the best. I think this kind of ranking in not very accurate because you can say a casino is better than others just because it gets more traffic every month.
The casino which gets more traffic is popular and therefore people visit those sites. If the site is not popular then we may not see consistent more traffic.
The only exception to this rule is that a casino is able to generate fake traffic (which is very unlikely to happen).