Digi-Key's US warehouse seems to be a customs transit area. At least I didn't get charged any tariff when ordering to Switzerland a few days ago. Not doing it

Digi-Key's US warehouse seems to be a customs transit area. At least I didn't get charged any tariff when ordering to Switzerland a few days ago. Not doing it that way would be an immense disadvantage for Digi-Key against non-US distributors.