In order to make $6 trillion by 2031, every human being on earth would have to spend at least $150 per year on average.

Maybe that doesn't sound like a lot if you're already paying a $100 a month for a Claude max subscription or whatever, but consider that the vast majority of people don't pay for any AI at all, and have no interest in ever paying for it.

Also, $150 is a best-case scenario where revenue is 100% profit. In actual reality, the profit margins are much, much lower, and may not even exist at all!