I'd to give people the benefit of the doubt when it comed to tip jars and take-a-penny, leave-a-penny trays (TAP-LAP), but in my experience they look very different. You see dollar bills in tip jars, not in the TAP-LAP trays. And tip jars are labeled "TIPS" in every place I've seen them.
An inability to read the label? Maybe. But, honestly, I think most people who fish money out of a tip jar have a super high sense of entitlement, and pretty much live their life thinking rules are for others, and not them.