According to the wiki, (https://wiki.openstreetmap.org/wiki/Tag:cycleway=shared%20lane?uselang=en) cycleway=shared_lane is exactly for this type of legally-not-binding paint-on-road "infrastructure" that just reminds car divers bikes might exist. In the US it's used for "sharrows" which is where they just paint some bicycles on the right hand side of the road without any demarcation. Since the yellow stripes on these two roads _are_ supposed to be for bicycles AFAIK, but are clearly not bike lanes (neither legally not practically since they are too narrow), I thought this tagging was appropriate - it's a marking telling cyclists to share the main car lane.

> every Swiss street is allowed for bicycles by default anyway

Yes but not every Swiss street has a Tiefbauamt-painted indicator. This tag is for the indicator, not the access (that would be bicycle=yes, which nobody tags on roads because as you said it's the default).

> Tagging it as such would make it look "cycle friendly", which it's definitely not.

It exists on the ground, so there must be some way of tagging it. We shouldn't not tag things that exist in reality because we don't like those things...

I don't feel that strongly about, though, it if you think it should be reverted.