[a3_nm]

Err... Google can just use a custom domain (e.g. "googleusercontent.com" that they already use) to serve user-supplied files rather than stopping the service altogether, so I guess this is not the issue here.

[marshray]

Do you have any idea what it takes to (securely) bring up a new domain at that scale?

Hint: Take a look at the Subject Alt Names on some of the Google SSL certs sometime.