Yeah , almost each casinos has the same providers so I think it is normal to have similarities , but the issue in OP is about even the front page and the color themed is almost similar in which come to idea that it is a copycat though it is not prohibited.
but i will not bring big trust to those site that manage to copy other sites interface when they can only spend small amount to have their own , this proves them to be no funds or budget in running gambling business.
Many site will choose light and attractive design to get more gamblers, maybe this is just a coincidence and with regards to the games, there’s a few game provider and most of the site have the same provider and that’s why the games are almost the same. Competition is good, and if you have a gambling site you will always aim to be more creative and introduce new games, those who can innovate will have a better chance of staying in the market and get more gamblers.
I'm not sure if this is a coincidence because I believe that op of whom I am pointing is already admitted that He is using almost same theme from the copied site in which i will not need to mention.
Indeed, for many players, the entourage itself created on the online casino site is important, it's nice to look at the visually attractive effects that certainly attract players, especially if you are in doubt to start the game or leave. But for players whose main goal is not to enjoy gambling, but to benefit from the UI/UX game does not matter, the main thing is that it should be a reliable and proven online casino, so it seems to me.
when we can play in different themed site? why need to play In copy cat one? I find it odd to decide lol.