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Google engineers want to make ad-blocking (near) impossible
(stackdiary.com)
This is a most excellent place for technology news and articles.
The EU has a larger population than the US, that's not a market you just leave. Also, Europe is not the same as the European Union.
The EU has a PPP GDP of $24.05 trillion compared to the US' $25.4 trillion. That is a market of significant size and leaving it will affect Google's bottom line.
You can compare Alabama and France all you want, that is irrelevant. Or should I perhaps start comparing Mississippi and Luxembourg?
Lastly, I don't know if you've noticed but Google isn't the only search engine in existence. Bing, Qwant et al. will gladly fill the void that Google leaves behind.