On another forum where I'm a long term member, someone reported being at Home Depot and hearing an announcement that cash was not being accepted. Apparently a lot of contractor types walked out.
Have you run into any businesses in your area that are not accepting cash?
As far back as a month ago when I went to OH to dive, manned tollbooths in IL, IN, and OH were closed. You had to use a transponder (EZ-Pass). The IN and OH unmanned tollbooths were accepting cash. I did this. You just inserted it into the machine. IL unmanned tollbooths that could take cash/credit are closed. Everyone has to pay online that doesn't have a transponder.
The Mackinac Bridge between the two peninsulas of Michigan is not accepting cash. You have to use a bridge specific transponder or debit/credit card.