Speaking of, I don't mind that in principle, but why does it linger so long on the "Success" page? It adds a handful of milliseconds of page loading and 30ms of computation, and an eternity (~seconds) of just an unnecessary delay before even starting to load the site I actually wanna go to, whys that?

Makes the page entirely unreachable from within the Harmonic hacker news client on android... Good idea in practice but defeats the purpose if it blocks legitimate users.

It's not a good idea in practice precisely because it blocks legitimate users. As it always will. It's not possible to do this sort of thing without blocking legitimate users.

Ohh, so that was the image I saw there. Good to know.