Other systems are possible. The fact that founders and investors don't explore them is easily explained: the current system is heavily weighted in their benefit

Other systems are possible. The fact that founders and investors don't explore them is easily explained: the current system is heavily weighted in their benefit, so why bother? Some of the more obvious other systems are also legally disfavored. For example American corporate law is really oriented towards equity-based corporations, not workers' cooperatives. This doesn't mean that an alternate legal climate would lead to everyone structuring tech businesses as workers' cooperatives, but the current American legal climate makes it difficult, so fewer are founded than might be the case in a more favorable environment.