Nothing they receive in their mailbox holds their attention long, the attention market is dominated by digital media.

>Again, they drive cars, use public transit, walk on streets, etc

With headphones in or bluetooth paired. Who the hell reads a billboard? Who pairs their cellphone with their car, or owns headphones? Damn near everybody. Just try to buy a new car without Bluetooth.

Old propaganda distribution channels are dead men walking, and everybody knows it. Unless you're advertising a chicken wings and cleavage bar at the next exit, you're a damn fool for paying for a billboard.

My brain has been effectively trained to pattern recognize advertising and filter it out, as it is so ubiquitous and so very rarely actually useful.

Old propaganda distribution channels might be dead men walking, but the new ones are just as much (anecdotally).