Most of these stories are about Amazon and again, at the scale that Amazon operates I think that this would be expected? With 1,000,000 employees, if you assume a yearly turnover of just 1% that's 10,000 people leaving the company and I'm sure there are quite a few people in that group who had a bad experience - particularly as this includes the retail operation, which definitely had a bad reputation (most stories on the website that you linked are about retail teams). Post the NYT story in 2015 a LOT of things changed in retail, but I'm sure there are still issues.
Not trying to be pedantic here, but this thread was about AWS and not Amazon, so I will just reiterate that I can't personally comment on Amazon as a whole, I can only comment on AWS and I think most people would agree that AWS can be put into the same category as FB, MSFT, GOOG, etc. I have highlighted this distinction several times, but you seem to not want to engage in a conversation about AWS and rather discuss Amazon as a whole. That's fine, but as AWS and Amazon are really two different companies, you are then comparing apples to oranges and in that case you should compare Amazon to e.g. WalMart?