alt Hacker NewsPeople calling it "reverse engineered" are not entirely correct.
The "Low accuracy, low speed, drone" concept has not changed since the V1 was invented by the Germans. Who then went ahead and built a more modern one back in the 80s. It should look very familiar:
https://en.wikipedia.org/wiki/Dornier_DAR
It has all the bells and whistles you can recognize: GPS guidance, shitty small piston engine, lumbering speed, launched from a box truck using a small booster rocket.
See, the funny part is that the project was considered a failure because they were designed as anti-radar munitions, to just hang around until a radar transmitted and home in and destroy it. But that part of the project never figured out a good seeker.
It's just convergent evolution. That's what the design requirements imply.
Makes sense, I presume any defense corporation (even small ones of the drone manufacturer style) could get one of these running in a few months if needs arise.
Now, for the defense model of "western" nations (once again, not saying this is a bad thing nor wrong), a dumb warhead that just lands wherever and explodes makes no sense, no tactic would be enabled by it, so I guess the natural course of actions is you get heavier guidance requirements (case in point, radar homing), then you get operation in GPS-denied environment, then some other part of the army decides it needs to be carried on fighter jets, and another team wants it carried on frigates, and suddenly you have developed a million-€ loitering munition instead of a 10k€ V1 tactical-analogue!