You are being a dick by taking my picture without permission. That's what it boils down to.
If you walk up to a random European on the street and start taking photos of specifically them, they’ll get agitated real quick.
From the lawsuit: "Ein gezieltes Fotografieren von fremden Personen ist auch dann unzulässig, wenn die Verwendung ausschließlich privaten Zwecken dienen soll."
Translation via DeepL: "Targeted photography of other people is not permitted even if the use is exclusively for private purposes."
[1] https://www.landesrecht-hamburg.de/bsha/document/NJRE0014656...
It's not like Hamburg residents have the freedom to opt out of surveillance cameras. Even Street View is back.
I would hope that such cases would use rules around harassment instead of privacy laws for people in public spaces.
Its actually silly how many people (in Europe at least) think they can forbid you from recording them “because copyright”.