The only data that cannot be stolen or leaked is data that doesn't exist. Hard lesson for both users and companies. Germans (because of course) have a word for this: "Datensparsamkeit". Being frugal with your data.
> Germans (because of course) I don't know if it's the reason you imply. In the 70s, there were big debates in Germany about privacy and data storage. They spoke of one's data shadow (Datenschatten). I suspect this word comes from that tradition. The reason the word exists would then be the reflection (Verwaltigung) on WW2.
So yeah, of course they've developed that type of distrust. Americans should have also after the 50-60s paranoia of red scare, black people etc. Instead they just spend a few decades building a anti-social state.