There are big casinos that are lower in this ranking, for example Fortunejack. However, I think you focused too much on those numbers. Of course, what information you collected is true, but I don't think it's complete. 1xbit has many mirrors for countries where gambling is restricted and I'm sure a lot of traffic comes from there, but we can't check it, so let's not talk about it.
Unfortunately I'm not talking about visitor numbers or casino rankings, but the percentage of how the casino page is displayed. 1xbit is doing more ad boost everywhere and I admit that, but what about the visitor traffic that displays directly on the 1xbit casino page?
If you compare it to
fortunejack, they don't advertise much but the percentage of live-show traffic is bigger than others. If I may analyze it, fortunejack has a higher number of visitors voluntarily opening their pages (not based on lucrative advertising offers) or is basically a higher regular player than any other source of traffic.
If it is true that 1xbit's monthly income is between $5m - $10m, then consider how foolish it would be to cheat someone for $500 or even $5000 .. Just think about it..
And stupid enough to think it's trivial, we will not know exactly how many player complaints every day and not all players share their complaints in this forum. Also, do any casino companies publish their earnings in detail? Claims can be falsified for the sake of popularity (I'm not accusing 1xbit, but that could be the case). What if the confiscated player money is part of the monthly income?