Why are maritime drones so hard to beat?

In this video I explain why maritime drones are such a difficult problem to solve, and why ships of all navies are vulnerable to this threat. The occasion is the replacement of the Russian navy chief, but my point is that they can fire as many high-ranking officers as they like, and it's not going to change the critical situation that the Black Sea Fleet is in. Because it's a technical problem, not a human one.