Corporations are intelligent, sentient entities which act on incentives. They don't have a conscious sense of self, but then neither do many natural organisms. That doesn't keep them from responding to their environment as if they're aware of it, and acting in incentive-driven ways.

Corporations seeking to maximise profits are exactly like humans attempting to maximise income. The problem is that corporations - like humans - have the wrong incentives, further diminished by limited predictive ability and poor heuristics.

So maladaptive behaviours emerge and stick. Both humans and corporations find a nice local minimum and don't move from it.

More intelligent behaviour would be able to predict and avoid existential threats without having to experience them first. But it's a question of predictive ability, not a binary absence of all intelligence.

So it's not that Google can't do better because it has too many employees. It can't do better because its cultural heuristics - which include it internal culture and the external culture it operates in - don't allow it to.