Starbucks vs Deliveroo giftcard

I tend to pick my Cashwalk giftcards a reward for myself. So I avoid grocery shopping gift cards. 

This time I tried Starbucks, but I prefer Blacksheep coffee...!

However, The only way I can use Cashwalk reward is to order pick up from Delivroo. 

And I noticed that Deliveroo price is more expensive than the menu in the cafe!!

So 5 pounds is not worth 5 pounds. 

What a shame.