Well no, it's not. If finding inefficiencies in capital markets was the most profitable thing to do, the capital markets would never invest in anything but themselves. Recursion hits bottom somewhere and investors, at some point, want to invest in a real business, not just in a recursive investment vehicle.
The "capital markets" are not closed. The "market" itself doesn't decide what to invest in -- individuals and corporations do.
I would expect an individual/corporation armed with real "super intelligence" to have a distinct advantage in this regard --- wouldn't you?
What better way to prove the value of AI than applying it to earn mountains of money in the open market --- instead of setting mountains of the stuff on fire.