Though now you mention it I wonder if any crypto casinos have ever gone to court to sue a copycat?
I know at least one case. You can read about it following the link below:
Cool, thanks, but my question was about a
crypto casino 
And then yesterday follow up talked about dice copies and the most common I've seen crash copies (we all know the famous Crash game that started it all, but I'm not so sure I'm familiar with the script, which apparently was stolen or copied easily, you see new threads come up about it countless times over the years.
But they have not as far as I know ever gone to court.