Think about this, that round up money never gets taxed, or reported that it was a sale. Tax free income with no investment or added overhead.
An establishment that has been doing this since last March is making pretty lucrative extra income.
Nobody in the gubermint is paying any attention to it either.
If you use a card, the business pays a 2.5-3.5% finance charge for using the credit card service. I'll bet they would really prefer that you pay cash and accept the bogus round up policy.