Can you provide us on what basis they are ranked or the site used any algorithm script? Whatever it is, I have some concerns about the method you used to determine the rankings as apparently most would not agree to them. For example, I have two favorites here: Fairspin and Betplay Meanwhile Rollbit was not good for me. The withdrawal took too long.
Based on his original post, his ranking and reviews are based on his experience while playing on the website. just like you probably had a bad experience with Rollbit, his bad experience is with Fairspin. as for Betplay, the ranking gap between Rollbit and Betplay is not far.