You're correct. I was wondering what we could deduce from that 10m number since Google felt it necessary to mention it on the landing page. It would tell us who they intend to market this to. It is a bit weird to restrict DNS requests like that. Or maybe they don't want people to abuse their service to create URL forwarders or some such. I suppose unlike startups, for a company like Google, anti-abuse mechanisms need to be baked into the design/feature set.