MIT grad that worked at Jane Street and made a Billion dollar “tech” company are things a lot of people would use as evidence of being intelligent.

Building a company based on fraud is potentially more of a marker of ruthlessness over intelligence, but certainly we don't know with certainty, and it is likely a combination of the two.

I would agree. He was definitely connected, and definitely smart. Anyone would drive in such a position could make a successful company. But he was ruthless and also has no moral compass, so he became a crypto fraudster.

Those things generally indicate that a person isn't stupid, but they don't indicate that a person is unusually intelligent.

passed quant interview at jane street.

Intelligence is unrelated to integrity, at least by common wisdom.

A common Warren Buffet quote passed around : "We look for three things when we hire people. We look for intelligence, we look for initiative or energy, and we look for integrity. And if they don't have the latter, the first two will kill you, because if you're going to get someone without integrity, you want them lazy and dumb"