Bitcoin is a closed system because it's impossible to reverse engineer it.
Why do you keep making such stupid claims? Bitcoin doesn't need to be reverse engineered when it is open source software. Anyone can look into it, copy it, modify it, make their own version of it...
But on markets we can reverse engineer about anything, companies do copy each other ideas, only bitcoin is a product that can't be reverse engineered, and
There are literally thousands of altcoins out there that were created by copying the Bitcoin idea and even the original source code. And you say that it cannot be copied?