Aside from them not HODL’ing it, is it just a case of hype behind bitcoin, or is it a real-world use case that shows the argument that bitcoin has the lowest transaction fees of any monetary network out there?

Because I don't see it as a win. It's essentially the same custodial and KYC Bitcoin liquidation service that PayPal just announced. Sheetz has been using this for years and it's not new.

I'm sure it is cheap on processing fees for Sheetz because Flexa is already holding the customer's Bitcoin. They liquidate it and send Sheetz fiat. The only transaction fees for customers appear to be moving their Bitcoin onto Flexa.