At Joe & the Juice in Palo Alto (cashless), I was buying a drink with my friend, and a clearly homeless man in front of us was trying to buy a coffee with cash. They refused and he got upset, so my friend paid for his coffee to de-escalate.
We were outside when the cashier ran up to us in the street, explaining "Please don't buy drinks for these guys, they come in here and get a drink and use that to stay all day. It's not the look we're going for, and it's one of the reasons why we have this cashless policy."
Cashless stores are convenient and I understand the arguments for them (as well as the arguments for not buying homeless people free stuff), but as long as cashless can be used to disenfranchise lower income people, I'm opposed to it.