Re: "checking the address on orders is close to or the same as pre-registered addresses."
> how about the plods get in their cars and try knocking on the doors to which the grub was delivered
Random college dorms and apartment buildings, I imagine. Follow someone in, answer the door, save the deliverer a trip to your putative 10th-floor apartment, wait a minute, walk out. Plods could trawl security camera footage, but for petty theft discovered days later, that's doubtful.
> A really basic security option is to require seeing the card the food is billed to when delivering
Trust restaurant employees and "gig economy" delivery drivers with customers' cards? I think not. Anyone can sign up as a driver/rider for these delivery apps. They're not gonna enforce the rules for their friends if they can avoid it, and they may purposely seek out apps with weak fraud prevention.
"We're gonna eat great again, and we're gonna make the hipsters pay for ALL of it!!!"