Not pointed at any one response.

It isn't the US. In the US most of us do not tip our Doctor, Nurse, Plumber, Grocery Store Clerk, or many other positions that do provide us a service but they are paid a living wage. Wait staff in France and many other countries are paid a living wage.

Also, on the Dutch side if somebody includes and clearly states they are adding 15%, don't penalize them for that. If you normally do 20%, add to it. On the other side of this, if they try to tell you it is something other than tip, don't listen and/or don't go back.