Until now, people from mostly the poorer and developing countries were not part of the global community when it comes to places like e-bay or amazon, because almighty Paypal won't let them, but bitcoin have leveled the play ground and anyone with some coins can stop by to shop.
Until eBay or Amazon actually accept payment in Bitcoin, people are still limited.
Right now your only option would be to get a BTC credit card from a company like Bitpay or Xapo
https://cointelegraph.com/news/6-cards-battle-for-bitcoin-supremacy-bitcoin-debit-card-comparison-testand use that to shop on Amazon.
Which means you are still incurring additional fees and being forced to use a third-party service.
Thats IF you can even find a way to convert local fiat currency to Bitcoin.
We need easier ways to convert fiat and more ways to actually spend BTC if the market is going to grow and make online shopping more accessible to people who can't use a service like paypal.
In retrospect, the picture was rather hopeless and some people had to falsify their identity to be able to scale Paypa'sl hurdles and many ended up shooting themselves in the leg. However the emergence of bitcoin have facilitated a turn, might not be the height it ought to be but there is always a starting point for every accomplishment and things gets better.