Lots of small businesses using square and other payment processors.
Honestly if a business told me that they don’t take card, I’d tell them they don’t take my business. Unless they’re an exceptionally skilled artisan (and I’m in the market for an exceptionally skilled artisan), their shit stinks like everyone else’s, and there’s another guy right behind them that will gladly take my money.
Man I hate having to bring cash for Facebook marketplace meetups, but at least then it’s worth the hassle because it’s an exceptionally good deal or unique item.