One thing that is surprising to me is that we haven't seen more open source software in crypto. It seems as if the two paths of open source software and crypto development are aligned in ways which could be mutually beneficial.
Most of crypto is open source though? It's just the fact that even if the huge majority of crypto are open source, 99% are still theoretically crap and useless.
Open source means too much plagiarism, means a lot is worthless. The core of the source code still has strong privacy, and many of them have left backdoors for their own project parties. Of course, open source code is also an important marketing method, in order to get more silly users. Behind the project is a sharp guillotine