You are not forced to leave a tip. There is no legal requirement to do so. Therefore, it is completely optional. As in, you have the option to leave one or not.
An economic system that puts employees in a situation where they rely on OPTIONAL generosity by the customer doesn't change the fact it's still optional.
It is a moral and societal custom, not a legal requirement. It is similar to holding a door open for someone following you into a building. Sure, it is "optional" in the legal sense to hold the door, but you look like an ass if you intentionally close the door on someone.
Still optional. You're just wasting your breath at this point. Sure it may make you look like an asshole if you don't tip. Still doesn't change the fact it's optional.
A custom is not obligated to be withheld, they are also optional.
You are not forced to leave a tip. There is no legal requirement to do so. Therefore, it is completely optional. As in, you have the option to leave one or not.
An economic system that puts employees in a situation where they rely on OPTIONAL generosity by the customer doesn't change the fact it's still optional.
It is a moral and societal custom, not a legal requirement. It is similar to holding a door open for someone following you into a building. Sure, it is "optional" in the legal sense to hold the door, but you look like an ass if you intentionally close the door on someone.
Still optional. You're just wasting your breath at this point. Sure it may make you look like an asshole if you don't tip. Still doesn't change the fact it's optional.
A custom is not obligated to be withheld, they are also optional.