It wasn’t necessarily Amazon that killed of the competition, it’s the tech behind Amazon (e-commerce) that killed retail stores. Just like UBER demolished the taxi industry, just like cars replaced horse carriages, and just like AI’s about to make knowledge workers completely obsolete. Amazon still has a great deal of competition from Walmart, Target, and lots of retailers.
They also killed a huge amount of e-commerce sites with their sheer size. This isn’t really about tech more about their monopoly.
Yes but no. E-commerce got rid of many retail jobs. So did WalMart. But Amazon also uses a ton of monopolistic and dirty practices. Amazon is working hard to eliminate the competition, because capitalists would rather control the market than compete.