Mobile crypto ATMs (ice cream vans)
More realistic than flying crypto ATM drones, which was my other showerthought 😀
Could have an app which alerts you to proximity of an ATM 🙂
Or just an Uber-like transport service that doubles as crypto / fiat exchange.
We need a discrete "crypto exchanged here" graffiti sign! I didn't want to call it a hobo sign, but yeah!