> Which is not how masks are supposed to work (we were told to mask to protect others)
A well fitting N95 / FFP2, or better, respirator mask protects the wearer to a large extent, even if others don't mask. The "protect the others" message was in 2020, when mostly only surgical masks were available.
I know. But we are talking about mandatory masks here and it only ever was about surgical masks in my country and bordering countries (except Hamburg at some point apparently). The sign is referring to those masks as well, which were the most common ones in circulation. The people who wrote the sign didn't have N95/FFP2 in mind when they wrote it.
A well fitting N95 / FFP2, or better, respirator mask protects the wearer to a large extent, even if others don't mask. The "protect the others" message was in 2020, when mostly only surgical masks were available.