https://www.theregister.co.uk/2018/05/31/amazon_blocking_australia/

Amazon has decided that rather than try to collect Australia's Goods and Services Tax (GST), it's going to force locals to shop only at its Australian store.

At issue is the Australian government's long-held (and long-criticised) desire to levy GST on all purchases made from overseas vendors, replacing a policy of taxing only imports priced at more than AU$1,000.