Google's subject to U.S. law, they can't knowingly maintain a child's personal data without parental consent (which is a manual process). There are also further restrictions on the types of marketing they can do to children. It is fine if the product, like gmail, doesn't target children and they don't collect age info, but once they do know age they've got to either get consent (costly) or shut down the account.

That's okay with me and I wasn't criticizing Google, just stating what happened. My recollection was that I was able to get the account re-activated by providing a CC #, but once I was aware it was in violation of the ToS, I switched to a different provider.