> The idea that GDPR requests have to be honored by some local ecommerce company in Idaho is just nonsense and not supported by any international legal precedent.
This is true. GDPR would only apply there if they were "offering goods or services, irrespective of whether a payment of the data subject is required, to data subjects in the European Union". [1]
This is understood to mean they must be marketing to the EU, for example by offering their site in European languages (apart from English), using European currencies, or using a European domain.