I've noticed a related phenomenon to this, one that (I assume) comes more from POS providers like Square than from businesses themselves: the default "flow" on

I've noticed a related phenomenon to this, one that (I assume) comes more from POS providers like Square than from businesses themselves: the default "flow" on these tablet-style POS systems doesn't distinguish between culturally tip-able transactions and ones that are not conventionally tip-able. As a result, people feel pressured to tip on things that weren't previously considered. A concrete example: a bakery near me uses the same POS terminal for both cafe sales and bread sales, meaning I get asked to tip on loaves of bread. I've seen people get flummoxed and tip $1-2 on bread sales because of this.