Hack it or jam it.
For instance but from 2016:
"Icarus works by exploiting DMSx protocol, granting attackers complete control over target drones that allows attackers to steer, accelerate, brake and even crash them.
The loophole relies on the fact that DSMx protocol does not encrypt the 'secret' key that pairs a controller and hobbyist device. So, it is possible for an attacker to steal this secret key by launching several brute-force attacks, Andersson explained in his presentation."
https://thehackernews.com/2016/10/how-to-hack-drone.html?m=1