Here's an example, I recently saw a couple (vloggers) who took a 1-day challenge wherein they can only use Bitcoin as payment in Boracay (a popular tourist destination here in the Philippines). They've paid BTC through an app called Pouch.ph. The app converts the BTC they've paid to fiat (Philippine Peso) when the store/seller recieves it. It kinda beats the purpose of Bitcoin and whole idea behind it but it's a good start.
They could have used any other bitcoin/crypto debit cards in the same way like they did with Pouch.ph and gotten the same results. Many people would say that can't be considered as paying with crypto. I think it still should count. You are making a crypto payment on your end. Everything that happens after that isn't something you should concern yourself with. Whether or not the merchant keeps the coins in their original form, converts them to a different crypto, receives them into a casino account and gambles them away, or uses a payment processor to convert them into fiat, you still paid in crypto.