Mostly just invented things, patented them, then brokered the deal, often donating the patents to the Open Patent Foundation in the process so that nobody could monopolize the idea in the medium term. For example, he patented the idea of using uploaded gastropod neural nets to run a nanotech factory on an asteroid, then hired the uploaded gastropods themselves as part of the deal (they wanted to “swim away” from the noisy and dangerous and inexplicable humans).

As a result of hundreds of these types of deals he no longer ever uses money. When he orders a drink in a bar someone who made it big off of one of his ideas picks up the tab. When he travels an airline gifts him the tickets. When he wants to buy lingerie for his girlfriend, he finds that every lingerie shop on the planet is willing to give him free products because he once testified as an expert witness against an obscenity charge in a trial of a pornographer or something. His girlfriend, meanwhile, works for the IRS and is chasing him to try to force him to pay millions in taxes on the vast income that the IRS is sure he is hiding.

A pretty funny story, actually, and the way he eventually gets the IRS off of his back is hilarious.