Isn't the issue that in the gulf these drones are being targeted by missiles that are more like $1M each? https://en.m.wikipedia.org/wiki/Flakpanzer_Gepard are not mounted on ships afaik although I expect there are similar solutions. Update: it seems electronic warfare (lasers, microwave, GPS suppression) are favoured as they don't run out of ammo. Against a drone swarm attack mixed with anti ship missiles the ballistics are reserved for taking out the ship killers. Striking the threat at source is even better which the US and UK are doing now. https://www.reddit.com/r/WarCollege/comments/17dgocl/how_should_warships_deal_with_the_issue_of_being/