It’s discrediting valid concerns against card-payments. It’s invalidating how great cash is.
It’s when the worst person you know makes a good point.
And things now are so Culture-Wars-y, nobody makes solid analyses any more, that when the far-right say cards are bad, everybody jumps to thinking cards are good.
I think it’s illegal here, too, but they started doing this at covid, after years of trying. If you fight them with it and try to make them accept cash, they’ll just ask you leave. If you stay after being asked to leave, you’re now trespassing, which is also illegal and is treated much more harshly than refusing to accept cash.