Cash is always on and never has a technical glitch, just sometimes clerks who can't do math in their heads. And Bitcoin is always on and will usually work for as long as you have Internet access or a Bluetooth connection.
Last night there was a massive card payment outage affecting mostly Scandinavia but also many European countries
There was a problem with the payment company Nets and with many of their payment terminals
This is an excellent opportunity to remember REJECT the cashless agenda