Ethical to take an abadoned bike? According to The NY Time Magizine ethicist, yes.
#26
Cycle Year Round
Originally Posted by brokenrobot
Check your local laws, but it's usually illegal to store private property on public property for months on end... if you leave your bike chained on the street while you're serving overseas and you expect it to be there when you get back, you're being unreasonable. You wouldn't store your car and your furniture on city property while travelling, would you? No, you'd get a garage and a storage unit. So why should you expect to store your bike on city property?