I'm obviously not going to show my id to Zuckerberg's website or any porn sites, casinos because I don't trust those bastards. They're also not the police, so they lack the proper autoritah to request my an id.
I think the point of the comment you are answering to is that in Switzerland, they are building a system where you can prove your age without telling who you are to the website, and without telling which website you visit to your government.
