Empty Bike path on the Tiber

I was in Rome recently and saw plenty of bikers on the street and some couriers. The traffic was not too different from New York. The surpise though was when my wife and I took a walk along a beautiful bike path along the Tiber river. We walked for around 3 miles and only saw 2 bikers the entire time. Rome also has a bike sharing program like Paris and I thought I might take advantage but although I saw many bike sharing stands I never saw one bike or anyone riding a bike share bike! If anyone know the background about the relative success or failure of Rome bike sharing program let me know.