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Have you? Assuming Google would want to not put all their chips on that one number and invest all available capital in the purchase of a nation, and assuming that nation were open to being purchased in the first place (big assumption; see Greenland), Google is absolutely still in a place to be able to purchase multiple smaller countries, or one larger one.

Greenland already has a wealthy benefactor, I'd be surprised if poor countries wouldn't be interested

https://en.wikipedia.org/wiki/Hyperbole

You don’t have to go ballistic!

Nauru, possibly Tuvalu.

The USA.

That one's not a "could" as it's already been done. ;)