ISIS was using DJI drones[0] effectively[1][3]. There’s even been drone swarms using commercial drones in Ukraine.[2]. Even well funded armies like the IDF are using these things.[4] Weaponizing hobby drones has been happening for a long time now.
[0] https://news.vice.com/en_us/article/mb9wmb/isis-will-no-long...
[1] (content warning: the propaganda video linked to i this article shows a death.) https://www.funker530.com/abrams-tank-commander/
[2] https://globalnews.ca/news/4236518/the-new-drone-warfare/
[3] https://www.c4isrnet.com/unmanned/uas/2018/01/05/how-650-dro...
[4] https://www.bellingcat.com/news/mena/2018/06/18/first-isis-i...