What sort of investigations provide a balanced view, then?
I don't know that there are many articles I've read about Amazon that have a balanced view. I will say that many people who are anti-Amazon have this picture of Amazon as being more ruthless (and smarter) than it actually is.
For example, an Amazon seller can make the claim that Amazon used it's access to marketplace data to research info about their product sales and then compete with them. But as an insider I believe the reality is probably far more stupid: a seller who had their product "copied" by Amazon was likely just a middleman who was using a factory in China to make their product. The middleman is basically just extracting value from being a middleman. But most Chinese factories produce extra product on the side. Once they setup the toolchain and processes for building your product why not keep the assembly lines running a bit longer and produce a few thousand more copies of your product? Or maybe the factory keeps a big stockpile of the rejected product that was slightly bad quality, so they couldn't send it to the original middleman. And if you are this Chinese factory then why not sell this extra product (mixing in the lower quality rejects) directly to Amazon for Amazon to list as an Amazon Basic? The factory can make more money by cutting out the middleman, and some ignorant Amazon product acquisition worker will buy that stuff, not even realizing it is what it is. No "sensitive business information" needed. So "Amazon copied my product as an Amazon Basic" is probably way more dumb than it sounds.
Or the "Amazon copied my product idea or roadmap" claim from the article. Do you realize how many ideas there are floating around in Amazon when you have >1 million employees? Any idea you can come up with has already been suggested dozens of times by Amazon employees and was probably also requested by Amazon's own customers via support a couple thousand times. The only question is whether that idea is worth building now versus worth building later. And as it turns out when there is real demand for an idea there tends to be multiple people who start building that idea at the same time. In fact sometimes there are multiple teams within Amazon who start trying to build the same thing at the same time, and they didn't even know about each other. Often one team fails to build it while another team succeeds. The duplicated effort eventually gets sorted out, but it happens a lot.
This is the type of scenario that happens time and time again. It's fun to write a click attracting story about Amazon as this big brutal force when the reality is most likely much dumber than it seems.
The other problem with the article is it does not point out some obvious problems Amazon has. First, Amazon is expensive, and people can and do go else ware. Second, Amazon's retail side is mediocre. Amazon's retail web page is basically a product search engine. Outside of search, Amazon does very little work to help people find products they are interested in. Amazon also does almost no curation. This is why it is often hard to distinguish between good non-fiction books and books which spread disinformation. Third, a lot of Amazon initiatives have failed. Examples include Alexa (a giant money pit), the Fire Phone, Amazon's video game division (over a billion and basically only produced 1 moderate hit), Prime Video (a mediocre streaming competitor), etc. I have also heard Amazon has been destroying Twitch.
My main point is, the article paints Amazon as an unstoppable machine when in fact it is very fallible. It does some great things (AWS), some good things (Kindle), some OK things, and sometimes some very bad things.
Amazon's retail market is absolutely lousy with counterfeit goods, as well as products blindly imported from China (usually) which don't meet the standards required by regulation for such goods. This regularly causes injury, especially due to electrical fires, and Amazon has not been held to account for any of these practices.
Try heading to a street corner and selling counterfeit products: it's a crime, you'll be charged accordingly. Amazon has gotten away with this for more than a decade.