OpenAI charges about 20$/month to tens of millions of users right now. 240/year. About 12 billion per year. That's a market that could grown to billions of people with a long tail probably not paying a lot but being served ads; and a fat high end paying a lot more than that for an ad free/premium experience. They should be able to reach billions of users.
It's why Google is matching investments in AI like this entirely from the profit from ads.
Going to space isn't that expensive. SpaceX bootstrapped with a lot less than that.