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"in or affecting interstate or foreign commerce" was intentionally chosen, to ensure that the law falls under an allowed power of congress but also is exceptionally broad in applicability due to previous supreme court decisions.

E.g. Wickard v. Filburn, held that a farmer harvesting a small quantity of his own wheat and eating it affected interstate commerce, because the farmer did not consume other wheat available in interstate commerce.

Just about anything commercial affects interstate commerce by this definition.