The only two places I use that are still cash only are the Blackbird and a greengrocers in Godalming. All of the stalls on my local market now take card, as the new card readers that link to a phone seem to be pretty cheap, and if you don't take card they'll be missing out on sales. I think All Bar One in town has been card only for a while.
What I don't like is restaurants where the menu is online only and you have to order through their app - or it is very strongly encouraged to use the app. A friend who is a bar manager says it is a barrier to upselling, for instance she could ask a group of drinkers if they'd like some shots to go with their prosecco. Or she finds that for instance one person orders a mojito, and then she gets five more separate orders on the app as their friends want one too - would be much easier to make six all at once.