The town I grew up in had several public apple trees. I have fond memories of climbing the trees with my friends to get apples.

Maintenance is a thing, though. If not properly maintained, the apples will often grow too densely, yielding only small and sour apples. I would never consider the apples in my home town to be filling food - at best it would be a small snack. It would require a lot of labour to maintain a tree to the point where it would feed people in need.