You can watch a presentation which answers this question during the Optimism Fractal 26th event here.
In addition, you can read more about the history of Fractals in the below articles:
A History of Fractal Communities
https://optimystics.io/blog/fractalhistory
The Roots of Optimism Fractal
https://optimystics.io/blog/the-roots-of-optimism-fractal
Communities
https://optimystics.io/communities
