They had large amounts of nets available and were able to produce more because they were already a fishing culture.

Local fishing culture in the US is nearly extinct, and while commercial fishing nets might still exist, those supply chains are controlled by the same billionaire oligarch caste that will be unleashing these drone swarms on us plebeians.

Also, you'll have a bunch of nimbys taking down nets as fast as you can put them up...

Right but we’re not talking about a war here, we’re talking about a dystopian society. Most people are just going about their business, trying to keep their heads down. Maybe you and your friends are engaged in guerrilla warfare, but then you’re living out in your trenches in the forest or the hills, not walking into town to grab a pizza slice.

Drones can also drop mortar shells and there are already plenty of mortar shells with timed fuses. Then the drone can just drop the shell and have it land on the net and detonate above your head, blasting you with shrapnel.

Nets aren’t going to be a viable long term defence.