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You don't enforce that, the owner (or the owner's parents, etc) of the device set that policy. MDMs can all already do this, there just needs to be a more user-friendly/consumer focused MDM to allow parents to control their kids devices. Just have it warn "Out of country sites may not follow your device policy, do you want to block them (Y/n)?"

It’s called “Parental Controls” you don’t need an MDM to do it.

That issue exists with the current proposal as well or any proposal that leaves the enforcement on the website.

I think in addition to what OP said, the browser/device should let you set hard domain-level filters which are enforced by the browser/device.

This will not be ideal for applications / sites with mixed content, but gives the parent / guardian more control.

Same way the US enforces any internet foreign policy. Make the credit card companies cut them off,make advertisers cut them off. US controls most of the ways they could make money.