The delivery option is more convenient and takes less time out of your day than driving to a restaurant. My suspicion is that most frequent delivery app users are ordering food more frequently and from further away than they would drive to if the delivery apps were not an option.
In a similar vein, widespread full-autonomous driving cars will likely lead to more people taking longer commutes by commoditizing the cost of a ride and freeing up the time that would otherwise be spent driving.
Yeah, induced demand is a real thing, and a huge reason to invest in public transit and walkable neighborhoods in the first place, since they benefit from induced demand as well.
I personally really support autonomous cars for safety reasons, and to hopefully reduce car ownership, but the definitely didn't solve traffic or the external costs of cars. I hope there's an indirect path from then towards increased public transit.
Single occupancy vehicles make up most of the traffic on the road. For most people, the most significant cost of being on the road is their time. With self driving cars, our roads will be full of zero occupancy vehicles.
In a similar vein, widespread full-autonomous driving cars will likely lead to more people taking longer commutes by commoditizing the cost of a ride and freeing up the time that would otherwise be spent driving.