Well, yes. You have to prove you're not a robot by passing a CAPTCHA test, many places (including Gmail) "require" you to be over 13, and from Google's TOS:
13.3 Google may at any time, terminate its legal agreement with you if:
So I think the metaphor fits quite nicely, don't you?
> So I think the metaphor fits quite nicely, don't you?
No, I can setup my own MTA, or get a cheap account at a random host which will provide me an MTA, and there are a billion services out there to get email addresses.
You take a test to get an email address, have to wait until 16 for the privilege and it can be almost arbitrarily revoked?