Ask HN: Is people making thousands a week selling Aliexpress products on Amazon?

http://freedomfastlane.com/amazonprofits/ There are tons of blogs and youtube videos of people claiming making thousands a month just by selling products from aliexpress to amazon. Sometimes their business model is actually waiting for people to click buy on amazon to buy on aliexpress with free shipping to end customer! Anybody in HR already in this business? Looks like a lot of work to identify right products but maybe webscrapping and AI could help? Is this selling arbitrage business legal? Are people really paying required taxes?