Not the Steckernetzteilhersteller we deserve, but the Steckernetzteilhersteller we needed: Haribo. The candy maker.
I now finally have portable chargers with a true Schuko / CEE 7/4 plug where the PE is connected to the USB GND, therefore no tingly feeling on conductive device enclosures due to capacitve coupling of the secondary side.
Maybe this is also a proper fix for the awful power outlets in #ICE4 / #BR412?
EDIT: See replies, same OEM manufactured questionable powerbanks in the past.