I am well aware El Chalten is in Argentina, hopefully there's not a requirement to have a national base station to serve a particular country. The Patagonian location should be able to cover both Argentina and Chile effectively.
Interesting to see Chile's new Fibre network taking shape. I guess it was a factor in the placement decision for these base stations though I imagine they were also located in Chile for the higher wealth and economic stability compared to Argentina.
Europe might be considered the same geography regulations wise.
Strict regimes would want connections termination locally so they can monitor and implement content blocks/censorships etc. It would not be possible if the ground stations where not in the geographical control.
Depends actually,some countries want to monitor their inbound/outbound traffic so it might be restricted in that way in geographies requiring this, they can hardly add monitoring equipment in another country after all.