But his N=1 anecdote doesn’t prove anything. He shares a feel-good story about an early stage company with very high growth on a small base. This person is not a billionaire yet.
The actual comparison would be to look at all the startups with billionaire founders (so likely $10B companies) and then analyze the market dynamics that enable them to keep growing so fast.
That's an argument for AOC to make. This post is about PG responding to the argument she actually did make.
She has made vague, handwavy, and (depressingly) oft-repeated statements that "there are no ethical billionaires" and that "it's impossible to earn a billion dollars," but she has rarely supported with these statements with any facts or evidence whatsoever.
What AOC actually said was (linked in the essay): "You can’t earn a billion dollars. You just can’t earn that." That is a strong claim - a claim of universal impossibility - but it's the claim she chose to make. Because she made a universal claim, an N=1 anecdote is enough to disprove it by counterexample.