Not everyone is going to pay 20$/month, but an optimistic trajectory is they largely replace search engines while acting as a back end for a huge number of companies.

I don’t think it’s very likely, but think of it like an auction. In a room with 100 people 99 of them should think the winner overpaid. In general most people should feel a given startup was overvalued and only looking back will some of these deals look like a good investment.