That's not to undermine the substance of the discussion on political/constitutional risk under the inference-hoarding of authority, but I think it would be useful to bear in mind the author's commercial framing (or more charitably the motivation for the service if this philosophical consideration preceded it).

A couple of arguments against the idea of singular control would be that it requires technical experts to produce and manage it, and would be distributed internationally given any countries advanced enough would have their own versions; but it would of course provide tricky questions for elected representatives in the democratic countries to answer.