Grubhub: Free Chicken Sandwich Combo+ from Popeye’s with free delivery today and every Friday until 7/30 with purchases over $20 $20

Ok, so, upon experimenting there were a few ways in which this deal is interesting/broken which made it better for me, YMMV of course.
First, the cost of the combo actually counts towards the $20 you have to spend to get it for free, sweet. Second, when adding the combo you can choose extras that will make it cost more; an extra side, biscuits, an apple pie, larger drink. The combo, where I am at least, costs $9 with no extras and the delivery fee is (a ridiculous) $6 but when you start adding extras to the combo the discount maxed out at -$19.
In summary, what all this means is you can add up to $4 worth of extras to your combo making it cost $13 and so you only actually need to order $7 more to get the deal. Pretty nice deal to be repeating every week for the next two months.
As I said YMMV, good luck.
https://www.grubhub.com/