That's one downside, co-ops tend to remain small, due to the difficulty of scaling horizontal structures. This means it's easier to start one than to join one.

That's one downside, co-ops tend to remain small, due to the difficulty of scaling horizontal structures. This means it's easier to start one than to join one. (This is also why I highly suspect Valve is not truly horizontal: you will never get 100 people to agree on anything important.)