This is the future of warfare.
1) Get them to swarm - DONE.
2) Put a “stinger” in their tail - NOT SAYING.
Get them to swarm ...
Next, transition the concept to something larger.
If they could be made cheap enough, they could be rigged with proximity fuses and detonated when within close range of the target, they'd become smart ack-ack, so to speak.
At 1:50 in the video, things get pretty hairy. It reminded my of an old high-school lab movie showing an amoeba surrounding it prey.
If they ever became self-aware, they wouldn't want to be Kamikazes and maybe turn on their masters. :-)