my understanding is they paid the tarrif on the customers behalf then charge them the extra and and an admin fee alleady, so the customer was the importer and paid the tariff.
interest , so customers in countries with decent consumer protection could potentially have grounds for legal recourse or a refund as it cannot be 'repaired' . Ie regions where there is a legal expectation for a product to last 6 or seven years in 'normal' not degraded use?