Anyway it’s not only Burger King accepts bitcoin.

But yeah I believe that the food chain will not hold any of their bitcoin payments under their cash register instead they will surely convert it once receive because business earns from day to day basis and not for investing,and maybe they were just ride the hype of 2017 to decide accepting crypto

And as what DdmrDdmr stated it’s BitPay stands as middleman for Burgerking to receive fiats whenever the costumer pays crypto.

Unless you are from Germany?so you can pay Burger King using cryptocurrency