When I worked as a waiter like many years ago we often got (on average small) tips in a Northern European Pizzeria, which we equally shared among all personnel.

It really gives a nice incentive to do the extra work and you get some extra income.

Now if we eat out , which isn’t often, and the waiters make it great experience, I at times do give a tip. 1 ~ 5 %. Demands really how long we’re sitting and the establishment I mean a döner shop would be too weird. I think you just know. Some people never give tips in Europe, that’s ok too. Abroad and on Holidays it’s a matter of grasping the feeling. Some establishments get upset if you tip them, and refuse.