Yea, I agree, it's a great book!
It should be said that Sara [1] was also the founder of the Freelancers Union [2], offering solo benefits and other resources to freelancers.
The book is great because it's so practical, with 3 org design principles [3]:
[1] A solidaristic community [2] An economic mechanism that supports the community's mission [3] A long-term time horizon where the economic value is recycled back to the community