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The Goalkeeper CIWS costs something like $3000 per second that it is firing. It's not a cheap system!

It could be scaled down to the size of a normal minigun, but even that is about $50 per second.

Meanwhile drone costs keep falling, Ukraine is well below $500 per drone now.

$500 for a drone including its bomb that can incapacitate a military aircraft and can survive multiple bullets?

Also, I don't think you need 30 mm bullets to take out a drone. Those bullets are for much more hardened targets.

All of these weapons fire a 1-2 second burst to make sure they hit the target. Don’t forget that the drones are moving, there’s wind, etc…

Modern CIWS will use radar to track their own outbound bullets and adjust their aim in real time to hit the target.