You are never obliged to tip, legally.
Tips are for situations where a service worker is selling their labor to you directly without an intermediary; the tip allows you to in turn pay them directly without the managerial class taking a cut.
You are never obliged to tip, legally.
Tips are for situations where a service worker is selling their labor to you directly without an intermediary; the tip allows you to in turn pay them directly without the managerial class taking a cut.