Some notices concern exactly one household. The payment that is outstanding, the noise from the third floor, the cellar unit that has to be cleared. On a paper board they still end up in the stairwell, with a name or a flat number, and therefore in front of everyone else.
It rarely stands out at the time, because in that moment it is practical: the person is reached without anyone driving out. What follows is where it gets uncomfortable.
Who reads the notice besides the household it means
Everyone in the building. Plus everyone passing through: the post, the contractor, visitors, the person viewing a flat. A stairwell is semi-public, and a sheet behind glass does not distinguish between neighbours and strangers.
And it stays. A notice comes down when someone is on site anyway, not when the matter is settled. Weeks often lie between the two. Under the revised Swiss data protection act that is more delicate than it looks.
What helps in practice
Most of it can be said without a name. “Cellar units without a label will be cleared on the 15th” reaches the same people as a list of flat numbers and names nobody. Where a name really is needed, the message belongs in the letterbox and not in the stairwell.
And when something personal does go up, what counts is how quickly it comes down again. That is exactly where paper loses: taking it down means driving out. On a screen it is one click, and you can set a date at entry on which it disappears by itself.
What the screen itself learns about residents
Nothing. There is no camera and no resident login. Only anonymous counting takes place: whether someone moved in front of it and whether someone tapped, with no reference to a person. The data sits on servers in Switzerland.
That is not a side note, it is the reason a screen in a stairwell is an option at all. A device that recognised residents would be a bigger problem in this spot than the sheet of paper it replaces.
This piece describes the situation and is not legal advice. What applies in a specific case belongs with a qualified professional.