Aliexpress customs duty!

Hi! I'd like to create a dropshipping store with aliexpress and shopify.
My target countries are UK and Australia.
I had every thing planned in my head but i totally forgot about customs duty.

So the question is:
How these big aliexpress based shops like – (newchic, rosegal, rosewholesale etc..), deal with customs duty? Because i've noticed that…

Aliexpress customs duty!