@LukeAlmighty@gameliberty.club in America, waitresses are notoriously underpaid and each restaurant makes use of tipping to argue that they earn enough.
Some countries see tipping as an insult (indirect way of saying to get a real job or something)
I personally tip if I think the service was nice, but I don't tip as much as some other people do. Usually up to 3 Euro.
Though in Germany, tipping isn't done by everyone either.
@mizuki @LukeAlmighty @kura everyone here in the US says that the minimum to tip is 12%. If your meal is only like $15 that's not a whole lot of money. if my waiter was a dick i won't tip them at all, but if i liked them i'll normally leave $5.