The drones are rather large: https://osmp.ngo/collection/shahed-131-136-uavs-a-visual-gui... and have a flight ceiling of about 4000m. It is probably roughly comparable to WW2 aircraft, given that it's driven by a piston prop engine. That suggests the need for similar technology such as "flak" anti-aircraft shells. However, that requires line of sight and has limited accuracy, while not being all that cheap to deploy. So if these guided interceptors can be built cheaply, with a decent hit rate, they might end up being cheaper than conventional AAA.