Germany had voluntary bike registration to prevent thefts, I still have an old bike with the sticker. Didn't work because the police just flat-out tells you tha

Germany had voluntary bike registration to prevent thefts, I still have an old bike with the sticker. Didn't work because the police just flat-out tells you that they will not investigate bike theft if you report a bike as stolen. You just get a copy of the report for the insurance, but they systematically refuse to do anything.