I dont think the west would have any issue making hundreds of thousands of them without the help of china.

Insanely simple devices still require a certain minimal amount of materials and manpower to assemble. The terrible secret of the Chinese economy is that they simply have more people doing more manufacturing labor. Sure, they often have state of the art equipment and a robust, heavily industrialized logistics system (one reason why western efforts to pivot off-shore manufacturing to Indonesia, Malaysia, India, and the Indochina Peninsula haven’t been particularly successful). But first and foremost, you need physical labor. Americans don’t have a superabundance of domestic labor, so they’re not capable of rapidly churning out lots of low-cost, disposable weapons systems at a rate comparable to the Chinese mainlanders.

And that’s before you get into the cost of deploying, maintaining, and upgrading a large network of low quality units over a long time frame. Imagine building and deploying an entire fleet of Mark 1 Defense Drones to the island, only to discover a major security vulnerability that renders them easily inoperable. You’ve got hundreds of thousands of these units in the field, all of which need to be recalled, patched, and re-tested. That takes manpower, too.

The reason these low cost easily distributed systems work for, say, Houthi Rebels and Palestinian dissidents is that they’ve got these diffuse cells of insurgents with very little else to do except fight. These large ad hoc guerrilla forces are more a consequence of the deplorable state of the local economy than the fighting power of the region. Idle hands, etc.

Americans don’t have that. We’re at near full-employment. We can’t peel off a tens of thousands of young men to go work on the drone assembly lines without suffering economic shortfalls. Hell, neither can Israel, which is why their domestic economy is tanking while they try to make war with virtually all of their Arab neighbors.

The Chinese economy has capacity to spare. The American economy does not. That’s the same problem the Japanese ran into during WW2, and a big reason why they got washed in Mainland China after a decade of horrifying genocidal occupation.