What really doesn’t make sense from a customer perspective is that recently everywhere you go somebody is asking for a tip, but you’re only expected to tip:
Taxis but not busses or trains.
Restaurants but not fast food restaurants, and sometimes restaurants add a service fee that may or may not include the expected tip, especially if you are with a large group. Typically, you are expected to tip if you are assigned a seat, somebody takes your order while you are seated and brings your food to you, and you pay after you eat.
Food delivery but not any other kind of delivery.
Examples of inappropriate places where a tip is sometimes requested but not expected:
When placing an online order from a warehouse.
When placing an order at a fast food restaurant.
When buying something that you picked up off a shelf yourself and carried to the checkout.
What really doesn’t make sense from a customer perspective is that recently everywhere you go somebody is asking for a tip, but you’re only expected to tip:
Examples of inappropriate places where a tip is sometimes requested but not expected: