I was in Waimalu today after dropping something off to a friend.  I stopped in the Safeway and figured something to eat would be nice(not Safeway).  Always liked Waffle and Pancake BLD, the loco with fried rice.  Anyway, walked in and saw a sign on the counter that said something to the effect, 'For better efficiency we are now cashless.'  I figured maybe i will just ask to make sure.  Waited a few seconds for the counter person to get back to the front, they weren't too busy.  So I ask her and yup, they don't take cash.  So I rotated 180 and waked out the door.  100% increased in check out time.
F them.   
My folding currency says for all debts both public and private.  I have cards but at this point it is on principle.  I guess i will be increasing their efficiency by them not having to fill my orders anymore.  I think the card readers said Bank OH on them. 
Burger slapper(king) on the other hand was more than willing to take my paper and ink.  Lesser quality food but there has to be a line somewhere.

There is no federal statute mandating that a private business, a person, or an
organization must accept currency or coins as payment for goods or services.
Private businesses are free to develop their own policies on whether to accept
cash unless there is a state law that says otherwise.

https://www.federalreserve.gov/faqs/currency_12772.htm

Having read that, it's still not good business practice to eliminate any form of valid, reasonable payment (chickens and pigs used to be accepted when paper currency was less common).

If you still want to go to a place that no longer accepts cash, I'd recommend using a credit card that includes reward points or airline miles, so you get something extra for complying with their policy.

Maybe the added cost of taking more charge card payments is offset by their cost of handling currency: accounting, deposits, having change on hand everyday and, of course, shrinkage.  I think it's easier to skim a $10 bill from the cash drawer than charging extra to a customer's credit card in a way that you can get the funds without ever getting caught.

Vote with your feet.  If you don't like the policy, let them know you're going elsewhere for that reason alone.  Maybe they'll offer you a free prepaid credit card so you can "load" it with your money and then spend it there or anywhere else that takes that card?  I'm pretty sure Safeway offers a slew of prepaid credit/debit/gift cards.

https://www.federalreserve.gov/faqs/currency_12772.htm

Having read that, it's still not good business practice to eliminate any form of valid, reasonable payment (chickens and pigs used to be accepted when paper currency was less common).

If you still want to go to a place that no longer accepts cash, I'd recommend using a credit card that includes reward points or airline miles, so you get something extra for complying with their policy.

Maybe the added cost of taking more charge card payments is offset by their cost of handling currency: accounting, deposits, having change on hand everyday and, of course, shrinkage.  I think it's easier to skim a $10 bill from the cash drawer than charging extra to a customer's credit card in a way that you can get the funds without ever getting caught.

Vote with your feet.  If you don't like the policy, let them know you're going elsewhere for that reason alone.  Maybe they'll offer you a free prepaid credit card so you can "load" it with your money and then spend it there or anywhere else that takes that card?  I'm pretty sure Safeway offers a slew of prepaid credit/debit/gift cards.

I only use the prepaid cards when buying stuff on the net.  Having said that, I know the CC's have pretty good protections when it comes to false charges and fraud on your cards.  Occasionally i have to verify if out of state or larger purchases that i cant do with a prepaid card. 
The prepaid reloadable ones usually you cant reload with out registering your SSN or something to link it to you when they offer the reload option.(no setting up your personal shell corp so to speak) Reloadables usually have a monthly fee and limits on them for deposits and withdrawals, I have done some looking at them.  All the gift card type have a one time fee and a limit of 500 max, some less, non reloadable. 

Yes I walked out because I chose not to pay with a CC(I have more than one).  I do get percentage back but do not feel like being forced to do so either.  More unhappy about the incrementalism of being shoved into the cashless society thing. 
Skimming the til is probably harder than you think.  Didn't look this time but pretty sure they have cameras there(both customer side and register side).  I worked in retail POS at grocery registers and gas stations in my younger days.  Fat chance of getting away with skimming in those places.  There were other ways i know some people use to use to skim the til that looked legit with out them being caught. This made management scramble to fix the problem.
Not applicable here, https://www.pewtrusts.org/en/research-and-analysis/blogs/stateline/2021/05/11/paying-with-cash-retailers-must-take-your-dollars-in-these-states

As a side note, I was involved with organizing my 30th high school class reunion.  As a convenience, I created a registration website and accepted mailed checks or either credit card payments or direct account transfers via PayPal.

Sure, there was a cost to taking payments through PayPal -- fixed fee plus an additional percentage of the transaction that came out to less than $5/"ticket" -- so I just included that in the $50/person fee.  That paid for the venue, the buffet, and incidentals with a little left for a donation to the school's planetarium fund.

End result: of the over 100 attendees, only two used a check -- one paying at the door.  Processing the payments to the vendor was a snap using a free PayPal debit card, and all transactions were 100% recorded to show all monies in and out.

Without making any moral or privacy judgements, electronic financial systems offer convenience and security cash systems can't for both the buyers and sellers.

IMHO.  YMMV.   

Flapp,

You should get the chip embedded into your hand so you can just scan it.
Safeway knows every purchase you ever made with their rewards card.
Maika’i card same way. Credit card and debit card same way.

Sometimes secure is not secure. Privacy judgements cannot be set aside. IMO.
Groveler ? Any thoughts ?

P.S. good thing Flapp can’t see my posts due to his light trigger mechanism. 
Groveler,
If you read this, don’t quote me just post you’re thoughts on the matter. I’m interested to hear your take on it.