"No successful web company (not eBay, Flickr, Amazon, Facebook...) succeeds because of a significant technological barrier to entry. It's not insanely difficult

"No successful web company (not eBay, Flickr, Amazon, Facebook...) succeeds because of a significant technological barrier to entry. It's not insanely difficult to copy what they've done. Yet they win and the copycats don't." Amazon had billions of dollars in losses before they were profitable; that's a huge barrier to copying what they've done. Not to mention their logistics/tracking technology. You can't run a company like Amazon or Walmart without incredibly advanced supply-chain management, etc.