I wouldn't say 12-15€/day is a cheap rental. And these are the prices you find everywhere. A lot of tourists are buying their bikes on flea markets instead and

I wouldn't say 12-15€/day is a cheap rental. And these are the prices you find everywhere. A lot of tourists are buying their bikes on flea markets instead and just leave them unlocked on the street before leaving. The bikes are probably then "recycled".