RC is line of sight control. Drones have autonomous GPS-guided navigation that can be programed for the drone to move to a series of “way points” that can be set for any point in three dimensions (above ground, of course!)
Several years back a hobbyist flew his “toy” drone airplane on GPS autopilot from Ireland to the US. The Islamist at the link below pulled the kit together to attack the Capitol and Pentagon!
“The jihadist drummer: Muslim musician held over plot to attack Pentagon with remote-controlled toy plane packed with explosives”
So. . .someone adds a camera and gets a high vantage point. on the top of a hill, or on the roof of a skyscraper.
Heck, this sounds like something an assassin might use. . . zap someone in their office, from blocks away. . . .