Imo most of casino look the same, because they have game providers and games. There is little to do when we speak about design and gambling. For example the table is often green or blue. Slots must be simple, so they wont load pc memory much and make page bulky and slow.
In any case though, I mean if you try to go and play on traditional based casinos, you will see the same game, the same slots and everything, but you can't say that the owner of the casinos just make a bad copy of others isn't it?
So yeah, I also don't see the logic behind the OP, maybe it's online, but still, anyone can make a copy of some successful casino but it doesn't mean that they created it hastily or something. And that is the nature of the competition, same slot providers so it depends on just how you are going to promote and be ahead.
I have re-read OP and users answers here, and it seems that OP is mostly disappointed that the games look the same and dont bring anything new. Either OP is new to casino business, or does not understand how it works. The logic of all games is more or less the same. Either get a combination of cards, or reach a specific number, or make spins and try to catch a combination. As I understood, for him, for example, when he play slots, he is disappointed that he needs to get a combination of fruits, colorful tiles and etc. A lot of slots look the same, while he has expected them to have more different spinning elements.
Even into those new platforms who do really make some launches then im not really that much having that kind of interested or having those interest considering that games offered would really be just that the same or something not usual on which it would really be just that it would be always that just the same and nothing that would be interesting and this is why whenever there's new then i do make some peeks
whether those things offering something new or unique that havent been offered on this market yet? or they would really be just offering those basic or known ones?
When it comes to similarities of design then just like the rest been saying that they would really be trying out to save up when it comes to overall cost on building a new one
and if its possible then they would really be making use of those current existing and have some little tweaks so that it wont really be that totally like a close.