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This casino gets over a million visits per month. In your opinion, are these few complaints a lot, compared to the number of customers?
Since I was curious, I checked on the statistics site. You're a little bit right about the number, but that doesn't mean it's completely customers, just ads displays. Previously, read about what "Display" traffic mean
here.

source:
https://www.similarweb.com/website/1xbit.com/#overviewApparently, 1xbit did a massive marketing campaign until it reached 57% traffic (the highest among casino sites that have campaigned on this forum). However, only 11% percentage of site visitors (customers and non-customers).
I'm sure you will say these statistics are wrong, but for the time being I believe these statistics for several reasons. :p