Your customers are not part of some shadowy cabal of non-tippers. They are all individuals. Punishing later orders for the actions of earlier orders just ruins everyone's day. You are providing deliberately bad service because nobody tips you, which means that nobody will tip you for your bad service. Customers get bad food, you get no tips, everyone loses.

Delivery 1, Alice orders a sandwich, doesn't tip. Delivery 2, Bob orders a burrito, also doesn't tip. Now you're mad, and start delivering cold food. Delivery 3, Cathy orders chow mein, would have tipped if it hadn't arrived cold. Deliveries 4-? arrive cold. Nobody tips for cold food, so now you're even angrier. As are the customers.

Literally nobody wins. Hell, you're probably hurting the restaurants you deliver from because cold food sucks.

It's one thing to be selfish, it's another thing to be this much of a fucking idiot about it.