Resolution of those cameras is limited and they are usually angled down. Also they are not on private property. So it can be assumed that max detection rate of a average sized done is maybe 80m tops, after that the drone itself is smaller than a singular pixel of the cam. Meanwhile range of those drones can be multiple km.

If u had said they can use the integrated wide band SDR recordings of cell towers to triangulate the remote controller…i would have given u a point, but triangulating a drone using cameras that look down is not credible.