Surely that can't be right? The US + Canada together have a population of under 380M. Even your low-end ARPU number of $1200 per year would imply North American revenue above $450B, far higher than Google's entire 2023 annual revenue of $300B [0].
(Even correcting for market share isn't enough, as Google Search has over 90% penetration in the US [1].)
[0] https://www.statista.com/statistics/266206/googles-annual-gl...