Commissioning and procurement have changed a lot here in Germany, accompanied by stricter and even nonsense regulations regarding for example disguised employment (Scheinselbstaendigkeit), a problem even in other jurisdictions (IR35 in GB for example).

As I wrote, I don't know the current situation in the US well enough to deduce more than guesswork from it. Here, at least, it has a great impact on someone's choice of the right organizational form. Cooperatives are not out of the question, but you have to consider some newer factors to do it right.