That is good news because people can try to pay using bitcoin to buy food in those restaurants. But for me, I don't want to use my bitcoin to just eat in those restaurants because I want to save every bitcoin that I have. I will still use fiat money than to use bitcoin, but I hope that other coins will be accepted as the payment transaction.
But using bitcoin as the payment can help people to avoid using physical money because they can use a mobile phone and scan the cost to pay the food. That will be like a cashless for making the transaction.
Everyone might not use bitcoin as payment in restaurants but I think this is also good for recognition. People using Just Eat will be able to see bitcoin in the payment option which is also good even if only a few will use it. It also has a good purpose why they included it since they saw a decline in using cash for payment. Though I also agree with you that I'd still prefer using cash. But it would also be great to see this kind of adoption in other countries as well.