@JonnyT @schratze @GreenSkyOverMe Well .. you can't monetize walking ..... but we have bike rental/sharing in more or less every bigger city over here in germany.. ;)
(In hamburg, it's actually pretty cool, just a few cents per minute, up to max 5€ for a full day .... and the first 30 minutes are free, so if you're able to bike from bike-station to station within that time, you can lock your bike at the rental station and immediately re-rent it .... that way you can travel though the whole city for no money at all. ;))