all airspace in not created equal
Banned, I agree, as I assume it is "controlled" airspace, with certain levels of mandatory equipment.
If I remember correctly, acces to continued use of Controlled Air Space, with defective equipment, is at the discretion of the Air Traffic Contol Unit.
So Ban, or enforce a reroute, or descend clear of CAS.
I assume: I would not be allowed to enter CAS without a transponder, so why should I continue in congested airspace.
windy