Comment by cwillu

You are given an order, which you can decline. If you decline more than a handful, you get deprioritized; in practice this means that you tap accept on every order as it comes up. At best you can sometimes shift the balance a bit by where you wait between orders, but during busy times (which is also when restaurants have long lines), your next order is coming up the moment you finish the last one.

It's also worth noting that most restaurants set the instructions for the pickup, which is usually along the lines of “go to the front of the line and provide the staff with the order number”.