This is so insanely brilliant that it almost makes me cry...
Privacy?
(As in, are we really giving Google yet another look into the websites we visit?)
Then browse through a VPN. Seriously, raising a privacy question about _this_ is just silly.
How does a VPN change anything? My point is that this gives Google easy access to stats about every website that is using Google-hosted web fonts. Like an old transparent tracking GIF...
I love it, but the font selection is pretty limited so far.