I'm surprised how few people are pointing out that you can simply trace the wire back to the control station. At roughly 1 km of actual range, that's not just mortar range, that's fucking grenade launcher range.
And even if you try walking up the fiber cables (if you manage to spot them), you will become a target yourself much earlier than you manage to locate the origin of the fiber, i.e. the drone crew.
So, that wouldn't work.
It'd take a lot of grenades, but there are videos from the Ukraine war of Ukranian infantry landing hits at range on Russian positions using drone spotters.