Well, after all, the coincidence in the graphical interface is more secondary than the coincidence in the concept of the exchange itself, Binance is a multi-platform, while Bybit has been a strictly derivative platform like Bitmex for almost three years. with the same simple registration and simple margin accounts as opposed to the more complex one on Binance.
Well, yeah, I think I understand why they have to mirror their interface because that's what works and most new companies that see potential in the market copy the ones who has been successful. I didn't look at it in the back-end side but I see where you are coming from.
Regarding the fact that the creation of an exchange itself requires certain skills and knowledge, of course, and the creation of a billion dollar exchange is all the more so, here you cannot do without the professional support of experienced people who already have knowledge in the field of managing such exchanges.
That's probably the reason why there are connections and similarities between them. Programming that from the ground-up would require thousand hours of work with multiple engineers producing it.