They do it occasionally. Chest fridges are harder to detect and tough to move(loaded with food). But after a while it creeps back. They prohibit storing bikes but their central storage for bikes is not ideal. They do not prohibit taking bikes on the elevators.I don't know what laws are applicable in your area mcowan but in the condo I lived in in BC, a tow truck towing a vehicle from private property at the behest of the property owner meant that the property owner was liable for any damage to the vehicle that resulted from the towing. That lovely legal word 'liability' stops a lot of things in their tracks. So rather than risk liability it was easier to threaten to force the sale of the unit.
Why doesn't your condo board simply send those with fridges on the balcony a letter from their lawyer threatening to force the sale of the unit if they don't comply?