The war on cash has been going on for decades. The U.S. abolished the $500 bill in late 1969. (The old $500 bill featured a portrait of President William McKinley, by the way. I remember seeing a few when I was a kid.)
Today's $100 bill is only worth 10 cents on the dollar compared with the $100 bill of 1969.
Europe will abolish the 500 euro this year. We all recall what happened in India in late 2016 when India abolished the 500 and 1,000 rupee notes (worth about $10 and $20, respectively); there was mass chaos as peasants lined up to turn in the old notes for digital credit.
ATMs were shut down because the replacement notes were too big for the ATMs!
Now the war on cash is being taken to a new level. China, the world's most populous country and the world's second-largest economy, has said that physical cash may soon become obsolete.