@neil For an individual I don't think the concept makes sense - you are dependent on others; for a large country,(-group) you can choose enough software with support in that country(-group).
Maybe digital Sovereignty was to some degree xenophobic; but once the country has pulled the plug on people for no good reason, it's a real worry not just a fear.
Relying on _one_ external country is dangerous - be that the US or China or whereever.
The same is true of relying on _one_ local provider!