Ah, I misunderstood your meaning.

Personally I'm not a cash guy, I used a debit card for 99% of transactions. If the machine looks sketchy I'll use a credit card as there is better financial protection at the cost of privacy. But for transient, time sensitive, interactions, like a park I only visit once a year or a fast food place that I may never come back to, I want them to take cash. If there is a problem with their electronic payment system (their site is broken, their cloud provider is broken, their cloud provider's ISP is down, ...all the way to local network trouble) now I am being denied access to physical thing that does not physically rely on electronic infrastructure.

My angry example above of needing to make an account to visit a park actually happened to me this week for an Ontario Provincial Park. It was extremely frustrating because there were no employees present to take payment that day, only a large sign with a QR code instructing everyone to pay online. Now every person in the line of cars a head of me had to scan the code, make an account, fill in their info, etc. Had there been a machine present to take cash (even if it was exact change only), most people could have scraped the coins out of their cup holder in half the time it took to interact with their phone.