“At the Demo Days drone field tests, a Ukrainian company presented a drone designed to shoot down enemy drones, including fiber-optic ones, as well as to engage infantry.”
This is a design that is being tested; it may work and it may not work. There is no harm in trying.
A kitchen sink will take out a good size drone if you can hit the drone hard enough with the sink. Right now the Ukrainians are throwing everything they can think of.
Necessity is the mother of invention.
On the other side I saw where the Russians have been putting broom sticks with explosives on the end of then with two wires out front when they ran the stick into the wing or body of a much larger long range drone boom it takes the wing off but doesn’t wreak the smaller FPV drone that was Lanceloting the bigger drone it flies back with half it’s stick gone and gets another lance put on.
It’s like NASA spent millions of dollars developing a pen that writes in zero g ,upside down ,in hot and cold , under water even. I own a space pen...the Russians took a hard grease pencil. Same vibe.