Say that Nvidia partners with open AI because they think open AI is the best positioned to succeed (and hence result in increase demand for Nvidia) as opposed to if they got some direct financial kickback, it that legal?
Probably yes if Nvidia has a monopoly. Because competitors of open ai have no alternatives they’ve killed competition. If doing so is to their advantage that doesn’t make it better, that just makes it rational from their perspective. But regulation against anticompetitive behavior targets behavior that structurally kills competition. Most collusion isn’t direct financial transfers but cooperative agreements to dominate adjacent markets for mutual benefit.