Tipping is quite normalized, at least in Germany. Just not the american tipping culture that substitutes wages. But it is very normal to round up bills in gastronomy, or add some cash when someone went above and beyond expected service and stuff. Like when I order takeaway and the delivery is made by bike during unpleasant weather conditions (don’t order during dangerous weather!).
I personally like it like this as a way to appreciate extra effort. The american tipping culture I feel encourages staff to be kind of unnecessarily subservient and guests to feel superior as the staff’s income depends on a guest’s mood, basically. It tips over the power balance.