This is a consideration, but not a deal breaker. Most weapons leave a signature (though to be fair, usually much more transient) of the launch location. Artillery has to operate under the threat of counterbattery radar and fires. I'm certain the Russian operators have figured out acceptable mitigations.
Depending on how you want to count either the Chechens or the Soviets invented a sophisticated method called Shoot-and-Scoot [1]. I wager this method also works great for drone operators.
You're not going to respool that wire anyways, those drones either find their way back autonomously or all have to find a target. After the attack just cut the wire and leave. You just have to be extra careful not to be detected before the attack.
Shoot and scoot doesn’t work with lots of drones near front line. You will be most vulnerable when you “scoot” actually. You need to dig in well instead
