I agree with your post.
But in some restaurants and bars, there is a tendency to add things to your bill.
Eat a pretzel from the rack on the table? Add $10.
Used the ketchup? Add $2.
The menu says beers are $4. But that was an old menu. Now it is $7.
Ive experienced that stuff many times in Eastern European and Baltic countries.
Turn the sign over and bingo you’re bar bill is 350
dollars. Got caught in the Ginza like that on R&R.