I actually asked "Eddie" from Stake.com during his weekly stream about the "friend" that opened a very similar casino to Stake.com and he said "not that I recall" ....but he also said that they are not too worried about sites copying their concept and that it was actually flattering that other people were doing this. (I guess, if you are printing money like them, you would not mind a lot if people copied you)
There are not a lot of big casino software developers out there, so I figure some people just buy a white label casino template from these guys and they just change the color scheme a little to fire up a new casino.
To this I will add that is way easier to copy something than to create something new, it is because of this that most of the innovations that we see in the market of cryptocurrency casinos come from established casinos which can allow themselves to experiment a little bit and see if a particular game or feature becomes popular, but for those that are just starting their journey and they are trying to make a name for themselves in this industry this is way harder and as such they prefer to offer the games and features that everyone is offering already.There are not a lot of big casino software developers out there, so I figure some people just buy a white label casino template from these guys and they just change the color scheme a little to fire up a new casino.