the physical infrastructure of the local internet will be, yes, but the network infrastructure, in a globalized world, is not in that country. Think of how everything in the Western internet runs on AWS. If the US goes down, which is more likely than a global south country going down, this is gone, at least for a while. Also cloudflare. there are some backbones that are not part of these countries, which would be an argument for building a local internet infratructure, as some countries have had to do. (Iran, for instance, will be just fine.)