> They [Clover] earn a percent of the transaction, so adding a simple option to increase the amount of the transaction is a no brainer for increasing profits. And the act of actually having to press no tip is better at guilting people than simply being able to ignore a tip jar.

I have wondered about this as a possible motive. I assumed that shops paid a monthly fee, or perhaps a per-transaction fee. But they're paying based on gross revenue? Do all POS systems work this way?