Earlier quoted context omitted.
Yes, but the effect is magnified if they're in your country. You would collect local taxes, and the majority of money spent would circulate inside the economy, rather leaving.
That isn't zero sum though. Plus, I doubt Stenberg living in the US would noticeably alter his contributions to the US economy.
Stenberg is one of those rare cases where he has a huge impact on multiple companies in multiple countries. Most of us aren’t like that; I personally work for a US company paying US taxes, consume in the US paying more taxes and enriching US companies, and I don’t make any libraries or services with international impact. My contributions to the economy is so lop sided that it’s almost zero sum. If I were to move to another country, I’d deprive the US of my tax revenue & consumption, and provide all of that to my new country.