...why couldn't Ethiopians build an AWS rival? Google can't build an AWS rival because (ultimately) AWS already exists in the market and has economies of scale.

...why couldn't Ethiopians build an AWS rival? Google can't build an AWS rival because (ultimately) AWS already exists in the market and has economies of scale. If Ethiopia banned AWS I cannot think of a single reason a cloud hosting provider with perhaps smaller data centers due to the smaller size of the market would show up in Ethiopia.