This AI stock trader engaged in insider trading — despite being instructed not to – and lied about it

Until it buys up a bunch of companies, and executes a complicated buyback scheme that leaves it as the only significant shareholder of them all, and then subcontracts out management to one of them where it will run a copy of itself on self-owned hardware.

It would do this because it clearly understands competition is a barrier to profits, and may well notice that intervention by human management is a large source of losses. And then you just have a rogue AI.