Which have failed horrendously.
If you really just wanted to protect kids then make kid safe devices that automatically identify themselves as such when accessing websites/apps/etc, and then make them required for anyone underage.
Tying your whole digital identity and access into a single government controlled entity is just way too juicy of a target to not get abused.
I'm Canadian, so I can't speak for other countries, but I have worked on the security of some of our centralized health networks and with the Office of the Privacy Commissioner of Canada. I'm not aware of anything that could be considered a horrendous failure of these systems or institutions. A digital ID could actually make them more secure.
I also think giving kids devices that identifies them automatically as children is dangerous.
It’s not perfect, but it does provide some flexibility to accommodate provincial differences. And the concerns people raise about the notwithstanding clause can just as easily occur in countries without it. Personally, I’d be much more concerned if we had FISA courts.