Plenty of locations that used to be BT phone boxes were replaced with pillars featuring WiFi and USB charging. Is this not pretty widespread?
This device seems a bit.. daft. Renting a Santander cycle costs 1.65 GBP. Add the high energy food required to supplement your diet after a 30 minute ride and this is looking closer to 3 or 4 quid for a phone charge, and that's before considering where the homeless person is going to securely stow their belongings while cycling. Luggage storage in Victoria is 5 GBP for 3 hours..