DHL, FedEx, and UPS are experts in overcharging to process a form and not caring about customers. Duty and VAT are usually low compared to this processing fee, and shipping has already been paid. Here is the catch in the EU, this simple duty form can be processed by the receiver, an agent (some related to the carrier), or an attorney-in-fact of the receiver. The big three carriers (and many others) threaten you if yo…
Same in Canada, though, if I understand correctly, you have to visit a customs checkpoint in person to make a declaration: https://goingawesomeplaces.com/how-to-avoid-paying-ups-broke...
CBSA should require affirmative opt-in to use the shipper as the broker, and allow you to file the paperwork yourself on their site.