> There are not very many systems one could conceive of that could do useful work 1/s for ~every human on the planet.

Roughly a hundred servers on 100 GbE ports each could handle one small UDP packet per human every second, and would have a plenty of cycles and RAM per human left to actually do some work.

That fits in a shipping container.

Illustrative of course: the point is that "for every human" is not far out there given how crazy powerful hardware has become.