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You are risking your own personal assets only, while a coop structure would involve risk for everyone.That would actual make risks smaller, as the investment and risk is spread across more people.
>Furthermore, you are founding a small business that you hope to eventually grow in some direction. That is very different from a whole set of workers founding a business where they wish to continue doing the same work they were doing before, only on a coop basis.
That's both not accurate (in the first part) and a shifting of goal-posts.
Who said Walter founded a business to try whatever and "eventually grow in some direction"? He had specific things in mind for the business to do, and pursued those.
Second, and inversely, who said people doing co-ops are against pivoting and trying stuff? That they "wish to continue doing the same work they were doing before" is a new, arbitrary, constraint.
Heck, people could start co-ops a) without having worked before, b) with people from different backgrounds, where the "same work they did before" doesn't apply, c) with people wishing to do something different than what they were doing before, not just with a different organizational model (e.g. build software of type X instead of working on mindless features upper management demands).