To say that bitcoin and its sole blockchain hold a monopoly on the future of cryptocurrency-based implementations is like saying in 2006 that LinkedIn was the only social network needed when it was barely leading, and when Facebook, Twitter and many other social platforms were still babies.

But why would anyone (especially David Cohen?) think that LinkedIn is entirely open-source software? And why would he think that Facebook was a fork of LinkedIn's source code? I don't understand this analogy at all.