> A challenge - try to register a Google account without providing personal information.

I got my first Google (at that time just "gmail") account back when you couldn't just register freely - you needed an "invite" from somebody who already had an account. At that time you didn't need to register any personal information. I did add a couple more accounts, mainly to keep high-volume mailing list registrations, and I still have one of those where there's still not any phone number registered.

Now it's different, I guess. And not in a better way.