Correct. If 250 M people use it in the US out of a population of 349 M, Google would make 401 B USD out of them, vs 403 B USD in worldwide revenues. These numbers do not look right to me.
If you’re going to extrapolate you should use the median, which would put it at 200B for USA.
If you’re going to extrapolate you should use the median, which would put it at 200B for USA.