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"Google doesn't provide timeX.google.com as a public service" seems pretty straight forward?

I read that as "It doesn't have the same quality as public Google services".

It links to some lengthy blog post about leap seconds, which ends with:

"Google does not offer an external NTP service that advertises smeared leap seconds."

I only skipped through the blog post, though. Maybe there is a more direct rule regarding the servers somewhere.

Being told "this is not a public service" seems to indicate that it's not supposed to be used by the public. That seems pretty cut and dry.