>I disagree. The ability to render a page could simply mean that parental controls were not enabled on the device.

Not being able to detect all children doesn't mean that being able to detect 80% of them is somehow less disturbing.

The point and overall goal should be to not signal anything to the server operator unless a credit card is being used. Everyone is whomever they claim to be as far as anyone is concerned, until payments are required which today means sharing identity and age (via the credit card information on file with the financial institution and is shared today).

In the case of RTA the only signalling taking place is a server header being transmitted to the client. The client could be anyone at any age. Nothing to explicitly leak or disclose. Server operators can guess all they desire as some do using AI based on user behavior of which they sometimes get wrong.