I think it's some variation of the efficient markets hypothesis. There are no problems that are both that lucrative and that easy to solve; if they existed, they would get dogpiled and stop being lucrative. Even in this day and age, $10B of revenue is an incredibly high bar.

On the other hand, $10B as valuation (not revenue) just requires a greater fool. Maybe it's possible, but I doubt there are too many of those fools available.