I’ll bump this up since I’ve got an interesting comparison point.
Two weeks ago, my wife and I were in Europe on a last minute trip. Business for me, pleasure for her. We went to London, Amsterdam, and Vienna. I’d say service was rarely bad, mostly good, but I can’t think of “great” service at any location we visited. We tipped a few euros here and there depending on service, what was ordered, etc. It was the same deal about 8 months ago when we were in Italy.
Right now, we’re in Hawaii on a long-planned vacation. I somehow forgot how ridiculous tipping is when you vacation in the US. Square is set up to ask for a tip everywhere - coffee shops, activities, even places where you order at a counter, have to go back to pick up your food, and then bus your own table. Several places tack on a 2-4% surcharge to pay for stuff like a “living wage” and “healthcare” and then expect you to tip 20% on top of that. It is a bit over the top.