Hint: not a lot. Other companies do it with having minimum offices or none at all
Several consultancies will happily open a "paper company" for you in Ireland or wherever you choose. No problem whatsoever
"Talent goes to Mountain View" [citation needed].
There are a lot of talent outside the US (V8 came from Germany, also Zurich, London and Dublin offices have technical openings, Australia, not to forget Belo Horizonte in Brazil) and inside the US (NY comes to mind)
Google's datacenters are spread across the world.