I don’t think this is true, wherever I’ve traveled the opposite has held - the finest materials are exported which is sad for the locals. Right away Wool stuck out as an example from Peru. I naively thought that going to Peru would guarantee me the finest wool at the best prices. Anyway I’d like to see some data that backs up the claim that junk Swiss cheese is exported to the US market successfully.

If you believe that price equals quality, the fact that Switzerland is an order of magnitude richer than Peru - and considerably richer than the US - might make all the difference.

I think perhaps what is going on here is that the most commonly exported variety of cheese exported from Switzerland is Emmentaler, which matches the US taste profile (and has holes), but in Switzerland is considered a rather bland variety compared to e.g. Gruyere or Appenzeller. Maybe that got a bit exaggerated and it was labeled as "junk" cheese somewhere along the chain of communication.