A sociologist was joking on twitter that “every time I dig a rule that has been on the book for a long time but doesn’t seem to make any sense, it ends up to co

A sociologist was joking on twitter that “every time I dig a rule that has been on the book for a long time but doesn’t seem to make any sense, it ends up to come from slavery” (paraphrasing) I didn’t expect tipping to follow the same rule.