Five finger discount! Or wear some shabby clothes and go to a food bank :)
technically fruit would be free in tropical countries all year round, though in somewhere like Europe you would need to preserve it (drying would be cheapest long term preservation)
Technically I could survive on rats and pigeons, but that strategy doesn’t scale as easily as washing machines and electricity. I would also need to figure out an energy efficient way of cooking them if I wanted to beat the washing machine on emissions.
It is much easier to pick up fruit with zero skills and you can eat it it raw compared to rats/pigeons + it scales with no issues, there is enough fruit for everyone.
I'm pretty sure cities have a lot more calories in form of rats than fruit.