The large numbers of small drones are usually very vulnerable to air burst munitions. Check out some videos of Germany's Skyranger SHORAD system, it's anti drone swarm is a start in the right direction. Of course 'hard kill' is not something that'd go over well in populated areas.

Even the soft kill has limits due to freq hop, limited AI capabilities for when contact is lost and then flying by wire with fiberoptic cables which are EW proof but much shorter in range.

Expropriating and incarcerating fully-loyal citizens and redistributing their property on behalf of their envious neighbors turned out to be an exorbitant waste of wartime resources, as some clear-sighted individuals predicted at the time.
I completely agree about the fully-loyal citizens being locked up as a waste of time, resources, and more likely to turn people away from the US.
I mean more the openly pro-PRC or very close ties to the PRC folks that for some reason are still permitted jobs within our government and key positions in private and public owned research groups.
At the very least these pro-PRC 'drone hobbyists' should face significant jail time for espionage related activities.