The tipping culture is very rooted in Americans. I was at restaurant in Europe and there was a customer (certainly American). He ate during 30 minutes or less, the waiter was nice but he wasn’t doing it for tips and the customer only saw him when he ordered the food and at payment. The prices are high end.
When he paid he was surprised that there was no tipping options (unfortunately we started seeing them in some European countries) and asked him to pay another 10€ as a tip.
In Spain, a server was nice to us, and even though I know tipping isn’t necessary, I gave extra. The server returned the money and gave us tips of how not to get pick pocketed. I guess they think tippers are easily scammed.
I forgot the name of the restaurant though. We sat in the bar and we ordered a bunch of small dishes, like open sandwiches. It was really nice.