What happened when you talked to him about it and offered him the sticker?

Maybe you need to pick up a box of black plastic bags next time you pass by the grocery store?

This post made you and a bunch of other people aware of where to go engage with the Swiss e-ID devs if you want, so hopefully you found that useful.

"Never bet against Ethernet." Bob Metcalf, probably

I looked into the Swiss version of this, which is documented here: https://swiyu-admin-ch.github.io/

They faced the same question. Here is their answer: https://github.com/orgs/swiyu-admin-ch/discussions/20

The tldr is that they have a legal requirement to bind "verifiable credential shares" with the same human who got the e-ID originally, up to the current best practical technology. On Android, they judge that to be "keep the private key in the HSM and require a local biometric (or PIN) unlock to use it". This is why they argue that proving your age will not be possible without a mobile device.

You can prove your age anonymously, for anonymous account, which can be used on a non-mobile device. It's just that the proving the age part must happen from a mobile device.

À propos of more or less nothing: in the Swiss context, websites requesting the proof will be required to request the least information necessary for their need. They must NOT ask for your name, ID number, or birthdate if the question they are trying to answer is, "is this person old enough for our service?"

This is excellent technology, and the Swiss law on it that we are voting for next weekend is an excellent law, so I urge a OUI/JA/SI vote on it, if you're a Swiss citizen.