[candiodari]

Government mandated authentication mechanism. This question is almost a joke: what could go wrong ?

Everything can go wrong.

> A not insignificant part of the large Internet companies power

So it's about breaking the power of large internet companies ? Figures. Can we please do that WITHOUT destroying the web ? The last regulation that tried to break the power of large internet companies was the GPDR, and that has significantly entrenched the position of the large internet companies instead, while creating a ridiculous amount of inconvenience for everybody. This ... will do the same.

People WANT to share that data. Or perhaps I should say, they want the things that happen when they do. Quick searches that get them the products they want, on Google, on Amazon, on clothing shops and on tons of small webshops. Even the obnoxious image ads. People want them.

That means that a login mechanism will just be an extra hurdle with zero of the effects you want.