The fact they also claimed to have minging equipment is something which always caught my attention.
I remember there was a statement on the website about mining in the past. They claimed that they were mining bitcoin and they pay the 4.08% annual interest from the profit they make through mining.
They were probably lying and after some time, they removed that statement from the website.
The only statement I remember it was about how they used their mining operations to fund all of the free Satoshis they gave away on theor fauced, I never paid attention to their annual yield because I never wanted to risk my money in centralized casinos, specially if they were messing with their own ecosystem, by introducing a token (FUN token in the case). Anyways, there are people called the administration of this casino to be complete liars for talking about mining with they seem to be unable to comply with the basics of their promises and give people their money back. Perhaps they indeed started with their mining projects, but with some time, they decided it was better just to get money from the volume on their casino only and not to worry too much about mining.