If that does become possible then the market will naturally establish efficiency again and the opportunity will disappear.
In the equilibrium, profits fall to zero in capitalism, but there's never equilibrium, everything is changing. Profit comes from insights that others haven't seen, from access to opportunities that others don't have, or through monopolistic control generating economic rents.
For that AI to make money, it has to have a harness that gives it one of the above things, which does seem possible.
But strictly time-limited, because as soon as someone else figures out what you are doing, there's no moat to prevent them from telling their AI to do it too.
Markets reach equilibrium very fast when everyone has access to the exact same tools and information.