The reality is that there simply are only so many games that can be offered in different combinations with lots of appealing graphics and fancy sound tracks. Beyond that the basic structure of a slot game remains fairly static with all the other stuff just being "fluff" and side games to distract you. I find it shocking simply how many games, usually white label design, you'll find that are shared between casinos - you can scroll through hundreds of the same ones on sites that you might not assume would be using the same software. Fiat currency and cryptocurrency sites now often use the same big game providers, meaning there is even less to distinguish them. On top of that certain casinos do try to add variety by running their own live in-house games, but they too are hard to distinguish.