Someone is paying them. Why continue delivering orders to someone who you think ordered, but then isn't paying?

What you’re saying makes sense but it contradicts what is written in the article. Also, there are many many different restaurants involved in this, so any one restaurant blacklisting him would not change it.

That interpretation is fine. He says "I have always refused the deliveries, so I have never paid for anything," but that's no indicator for whether the restaurant was already paid.

No, the likely harasser is searching for delivery services that allow cash on delivery for payment. They just don't use any services that only have pre-payment options.

That is what I am asking, if your delivering pizzas to the same address for a decade and your not getting paid, why keep delivering pizzas? Surely you can blacklist an address or ask for payment up front? There can’t be so many pizza places in delivery range of this guys house that you can order every day for ten years and nobody catches on that this address never pays.

"Stupidity" (often in institutionalized form where the department accepting the orders and the department trying to deliver the pizza don't talk to each other and everyone sees it as not their problem) is often a perfectly sufficient answer.

because you have to pay at the door. so nobody is paying