I've got 4 or 5 rc gliders in my garage and half a dozen or more kits or collections of parts to build more, as well as 5 quad copters that'd all fall under these rules.
At the height of my slope combat phase, I was probably averaging building 2 or 3 new slope soaring gliders every weekend. And I had friends who were _way_ more prolific than I was.
I wonder just how scalable their new "drone registry" is? It's easy enough to keep track of 747s and A380s, but whatever system they use for that was unlikely to be designed/specced for "webscale" type growth (and given their "$5 is the same price as we charge airliners!" comment, I wouldn't bet against this being exactly the same system/database)
And even ignoring that, this topic has been on the national news quite a bit recently.