The video intersperses footage of the drone on the ground with airborne footage that clearly is not of the same drone and probably taken from the Internet, since the airborne drone has rockets. It is unclear how functional the Hamas drone is altogether.
Nevertheless, the size of the Hamas drone indicates it can cause damage if it actually can fly - it can be filled with explosives and be aimed to crash into a target, for example. Or perhaps it can drop small firebombs.
The problem will only get worse.