300+ supermarkets accept it in Switzerland. It's not like they choose every crypto they want to accept, they just use a payment processor that supports a bunch. I don't see that as particularly hard to implement if there's demand.

Walmart probably won't, considering they don't even accept Apple Pay.

Spar Launches Switzerland’s First Nationwide Crypto Payment Rollout

https://cryptodnes.bg/en/spar-launches-switzerlands-first-na...