They haven't put ads in ChatGPT yet as far as I know. It doesn't really make sense to work off the raw revenue before they put the main revenue-raiser in. Search isn't a very impressive money maker either if we take AdWords out.
There's a reason Google and Facebook run the tech world as we know it.
Not impossible, but not a given.
On the contrary the math makes it very clear. They need a free user ARPU of $11 to 12 per quarter to be profitable with billions to spare.
That's a low bar to clear for a platform with 700M+ Weekly Active Users who are more personal with it than any Google search.