Check the Tech Ingredients YT channel.

Tech Ingredients YT channel made a diy microwave directed energy device to disrupt consumer drones.

More like: That could be useful, just not for (perhaps many) drones.

1km isn’t that far - the drones that were used for surveillance of Minneapolis protests in 2020 were around 6km up.

If they needed to get close for some reason, would a 1km deterrent be countered enough by approaching from directly above and using gravity for the last km?

And green lasers

Yep, one of those things the IT department takes care of and most other people just need to know to keep their devices updated.