Social Bicycles racks are designed to optimize locking of Social Bicycles while discouraging people from locking personal bikes. Clear messaging at each hub/rack makes riders aware of the designated use of these locations. In addition, many municipalities enforce ‘impound’ strategies whereby bikes locked to racks for longer than a pre-determined amount of time are removed by the operator or the City.
This happens across all bike share systems, as any infrastructure in the public realm is subject to the public's actions.