The main issue is that market evolution will always surfaces the most cost-efficient entities within the ecosystem pressures.

That means designing the ecosystem pressures is crucial: things more meaningful than just pure capitalist private-profit logic must by enforced by thoughtful regulation or otherwise the ecosystem converges for private-profit of a small sliver of individuals (billionaires) to the detriment of all other ecosystem members (99% of the world population).

This holds for anything broader than pure private gain, may it be security, social fairness or ecological topics. Sole monetary-value optimization for private gain must be properly constrained or else it results in pure predatory capitalism that implodes society from within, may it be through leaky security, poisoned environments or social unrest.