Who the F tips on to go orders?

I call in a food order for pick up (literally myself getting my own food) at different restaurants out back steak house , chilies , Olive Garden , apple bees and why does the cashier I'm paying to always look surprised when they flip the little tablet around and see i select zero tip

It's just such a joke that it's already set by default for me to tip 15% like wtf am I tipping myself since I'm spending my gas to get my food I'm never going to tip on to go orders at restaurants never ever! What do you all think of this ridiculous request

Is it just normalizing that now we need to tip the chefs that prepare the food that cost us already included in the ridiculous price of the food $50 for a side of garlic mash a 14oz steak and side of asparagus and a Coke