This should come as no surprise. The US use of such drones all over the world, with uses ranging from just surveillance to killing machines, was bound to trigger efforts by other countries to match that capability. Iran was undoubtedly helped by the capture of an intact US drone some time ago, enabling to do some reverse engineering.
And now that the US has unilaterally claimed that it has the right to use these unmanned vehicles to invade the airspace of other countries, other countries will doubtless also find the idea of being able to monitor the actions of its perceived enemies in other countries and even murder them highly attractive, because the risk of having a pilot captured has been removed. Drones offer the benefit of carrying out offensive missions with no risk of losing personnel, and thus the public seems to be more accepting of it.
Recall back in the 1950s, the US had stoutly denied that it was spying on the Soviet Union using high altitude U2 planes. But the Soviets managed to shoot down such a CIA spy plane in 1960, while leaving it almost intact, and capture its pilot Gary Powers and president Eisenhower had to concede that he had lied and negotiate a spy exchange in 1962. The lack of pilots in drones reduces inhibitions about using such vehicles.