Not especially exclusive to crypto casinos, but casinos in general. Ideas that make it big elsewhere are copycated all the time. I guess you'll know this only when you try all those shady online casinos that are out there, especially in China or Philippines!

Personally I think copycats are in every industry. If you have a mobile app and you don't want to pay, and are forced to watch ads, then you know what I mean. Thousands of ads all looking the same as each other.

Same as going to Google Store search 1 app, see 100 copies.