Fringe benefit of this sort of scheme is it is incentivising people to clean up littered items, so even if the person who originally bought the item doesn't care about getting cashback, you get a second chance via kids etc.
I think society has changed too much for it to happen again.
When I was a boy, it was normal for children to be out all day roaming around, usually on bikes and often covering miles. When I was in my early teens, maybe a little earlier, I often cycled ~40 miles just to visit the seaside and play the penny arcade games. Even as a younger child, I often spent hours out and about on my own exploring the nearby countryside (we lived near the edge of a town) or around town. The countryside seemed immense to me, but that was when I was 6 or 7. It was probably a few square kilometres. The next town was close.
Things are different now. Even with mobile phones (which only existed in sci fi when I was a boy), most parents have been taught to be too scared to allow their children that much freedom. I think they have some reason to be more scared, though not as much as they have been taught.
Also, when I was a boy the deposit on glass bottles was a lot more money than 20p is today. IIRC it was 5p per bottle back then, but my pocket money was 50p a week and that was a reasonable amount for the time. So a single bottle returned was a 10% increase to my income. 5p would get you as many as 20 sweets when I was a boy. Or a kit to make a model aircraft made out of polystyrene and powered by a rubber band, which was one of the best small toys I remember from those days. You could get many different ones. Which were pretty much the same one with different markings, but add a 6 year old imagination and they were all the planes of the world! What use is 20p to a child nowadays? You'd have to collect 50 littered bottles to even buy a small top-up for your phone, which might buy you 1 or 2 outfits for a character in a game.
Different times. Better in some ways, worse in others. But definitely different.
As an aside, years later I found out that the seaside place where I played as a young teen was close to thousands of tonnes of explosives in a sunken ship very close to shore and on mudflats that are part of a dangerous tidal range on which the shoreline varies by kilometres from tide to tide.
https://www.bbc.com/future/article/20151027-the-ticking-time-bomb-of-the-thames
By a very odd chance, the first person I shared the story with (many years later and way up north from my childhood home) after having read about the ship somewhere happened to have been a navy diver when they were younger and had been one of the people who had examined the wreck as part of one of the investigations into finding a way of safely removing it. That takes courage - to dive to a sunken ship knowing that it's full of explosives when nobody was sure how immersion in sea water would affect the stability of the explosives. I was seriously impressed. Not by the diving (it's very shallow, partially above water at low tide) but by the willingness to investigate a couple of thousand tonnes of various bombs. Nobody's come up with a way of safe way of disposing of it yet, so it's still there. Probably safe now, after all these years under water. Probably. Or maybe not.