The cost to benefit of expending the resources necessary to extract and purify the recycled materials is infinitely more expensive then simply importing or buying the raw material outright.

Not to mention that no one would be willing to send you only “good trash”, and you face the daunting challenge of sorting through megalithic quantities of useless trash for a few paltry recyclable materials. You additionally face the issue of now needing to dispose of the massive quantities of leftover waste with no recycling potential.

In some extraordinarily desperate fringes of the globe there are communities of people who do make a sustenance living performing such recycling, however the output is utterly tiny and non-viable for expansion.

The example of Japan prior to WW2, the scrap metal the US was sending Japan was fairly expensive and seen as a viable resource. The Japanese just needed to spend the time sorting the various metals. Further, such imports were a desperation move as the metals imported were of varying grades, types, purities; and so forth, making refinement and usage difficult, but for a country stuck in a perpetual war economy desperate for resources, something is better than nothing. However, replicating that system within a globalist world makes little sense beyond extreme siege examples.