The original version of which talks of an "Invisible hand" and if that's not an metaphor for divine intervention hidden by an chaotic system i don't know what is.

It's rather surprising how often almost all complex systems theories be it AI, cosmology or economics have an aspects where even the theorists are resorting "to because it is".

Sometimes those statements are based on measured data but it's not always easy or possible to do so accurately for highly interconnected system or worse system where you have actors reacting to theoretical model in a way that changes how the system behaves.

in that case the applied AI stops being a Search tool (as was the purpose of the search bar) and becomes a new Ad tool. And this masquerading is not a great thing at all, for the same reason why people don't like bots pretending being humans during phone calls.

I don't think it violates the efficient markets hypothesis. I think that entails "if it was possible for someone to create an AI that would make more money by showing something else, the AI would be showing something else." Roughly, efficiency means that the most profitable solution will be the one that wins out, but "profitability" includes the costs of building such an advanced system, assuming that it's possible at all.