An especially egregious case I've encountered was at Berlin train station.

Normally in Germany, you've got those distinct card terminals with a display where you see your total before paying. Some of those have started nagging you for tips which you need to explicitely accept or decline first before tapping your card. Not in this case though: after you've ordered your food, they point you to the combined order/pay display and while you awe at the technology marvel of combining both, you tap your card on that and then you notice that 15% tip has been automatically included and charged. You needed to notice some small text and small buttons in the corner of that display beforehand and actively tap on "0%" or something before tapping your card. I'm already furious they've let this tip begging to be added to the card terminals, but charging tips without explicit consent should be completely illegal.

At Schiphol they offer tipping options to presumably prey on Americans, but the attendant physically reached over the counter to reject it after I ordered in (native) Dutch. Can't imagine how much trouble locals had been giving the shop before training staff like this.

And I think people don't mind tipping when they feel it's voluntary

And wonderfully done in a city where people are usually paid a living wage, and even students don’t have to work for free (hi Belgium!)

I am pretty sure it is completely illegal.

I hate that the tipping culture is infecting Germany now