How come? It plainly negates the "easy" part. It's not easy at all, you need to scale your signal path to the magnitude of power. I.e. the expensive part.
True, but they can't use directional antennas nor lots of power, and once they're far enough from the transmitter inverse square law does the rest. Ground stations always have an advantage because of higher gain antennas and more power available.
FPV drones in the Russian war are generally pretty dumb devices, there's usually no frequency hopping involved to begin with. They have a lot more in common with baby monitors than with modern military comms.
So what? It's not the airborne platform with limited energy and an explosive payload that needs to do the jamming, it's the ground-based targets.
However, as pointed out elsewhere in the thread a lot of these jamming arguments are academic because drones are either tethered with a fiberoptic cable and/or navigating autonomously.