So, We have some third-party app that takes the order and takes money in bitcoins and then processes the order just like foodpanda does?
I have not tried out takeaway.com
Yes, it's middlemen on top of middlemen, lol. Burger King in this cases pays a fee to Takeaway for the exposure/listing of your restaurant, and then pays ShitPay a 1% fee.
Important to point out is that Takeaway has been accepting Bitcoin in several countries (Belgium, The Netherlands, Switzerland, Austria, etc) they are operational, and that for years now.