@neil your blog is mostly about individuals but I've only really heard 'digital sovereignty' in the context of states, e.g. "France" or "The EU". It makes a lot more sense in that context. We are, to some extent, dependent on US law (and executive power) when we depend on US technology. Our government gives up some degree of sovereignty when it hands govt IT contracts to Microsoft or Palantir, because some element of US law and executive power extends beyond its borders.