What if drone flew to place that there a signal jammer or on area that weak signal did you think will affect drone operation?
This is one of the concerns for those who wants to deliver things using drone. Some people make a drone catcher to sabotage drones in mid air and what if your cargo is there it will be your loss. They should think of the ways to counter this kind of things.
In terms of signal there will be no problem because they would do it because it will help them to have long range product delivery service. The only problem is the battery capacity and load capacity of their drones to fly during delivery.
For sure they will program their drones not to overreach areas that have a weak signal so that it won't be out of control. I think before they sell their drones, it will run so many tests so that it's safe and with high quality.