I always park my bicycle on parking spaces now. Because:
a) It’s legal in Germany. Even on parking spaces that cost money for cars or are time limited, you can put your bike for free, for as long as you wish. Because those restrictions apply to parking, and parking is something only cars do. (Exception: Private spaces)
b) I’d rather take away space from cars than from pedestrians.
I invested 10€ in a loud-as-fuck alarm from Alibaba that activates when the bike moves, so far it’s had a 100% success rate of discouraging cagers from trying to carry my bike somewhere else.