I suppose OP's point wasn't that a service fee wasn't justifiable, just that it's a bit odd to make it optional and have it auto-selected, though given someone else's comment it seems like now it's mandatory.
i know there has been a lot of changes with that recently -- i agree also that is odd. there are a ton of legal nuances here that i do not want to get into, but suffice to say we want to be clear and transparent to customers while at the same time providing a compelling wage to all the folks who touch your order during any part of the lifecycle.
