Post slavery, a lot of states in the south wanted former slaves to continue to work for free. Tipping waiters, porters, etc became common at that time, so cust

Post slavery, a lot of states in the south wanted former slaves to continue to work for free. Tipping waiters, porters, etc became common at that time, so customers could decide if the business would pay black employees or not. Proposed bans on tipping actually went through the courts, with some southern states ruling to ban it. Eventually, the supreme court stepped in, and ensured tipping would be legal. Anyway, modern labor laws evolved from that mess, so it's not surprising at all that paid time off is discretionary in some states.