This assumes that ads at google's or facebook's level would get them anywhere close to profitability. OpenAI's costs of doing business are only accelerating, all while burn rate continues to get worse. I have no doubt that selling ads will bring in a lot of revenue, but it'll be dwarfed by the numbers OpenAI needs to stop hemorrhaging cash every quarter. The great irony is that the more success OpenAI has in gaining users, the more money they lose at an ever-increasing rate. Lose on every sale, and make up for it in volume!