Because maintaining the organizational infrastructure to coordinate remote teams dispersed to time zones all over the world and with different communication styles, cultural assumptions, and legal requirements is a whole matter of its own?
Companies that can do that are at an advantage over those who can't right now, but pulling that off is neither trivial nor immediate nor free.
I worked for a company that was very good at that. It resulted in software organizations in 50+ countries.
I had teams in North American, Europe, Russia and East Asia. It resulted in a diversified set of engineers who were close to our customers (except in Russia where the engineers were highly qualified but few prospects for sales). Managing across cultures and time zones is a competence. Jet lag from travel was not as great...
Companies that can do that are at an advantage over those who can't right now, but pulling that off is neither trivial nor immediate nor free.