The generosity strategy Sam Altman outlines is coupled to a "fire fast" (here, "before cliff") strategy that is hard to execute in practice; it takes a degree of ruthlessness to fire someone not because they're incompetent but because they're not performing at the level required for their equity grant, and it's not the same ruthlessness required to succeed in business. It seems especially risky for the kind of startup team where all the engineers are hired by being referred in by their friends.