I think the difference is having a leader vs shepherds. Most open source projects have shepherds who do a lot of invisible work.
The project I work on has around 100 regular contributors, but also a few small teams, either volunteer or staff, who meet regularly and make sure things move forward in a coherent and sustainable way.
Open source does self-organise, and manages to produce some products of exceptional quality. It’s just almost completely unsteerable.
In a company, you can pretend to order people around. But the truth is that what really matters is how all the personal and political goals happen to align.