Amazon itself admits to use what is called, "algo curation". It uses rankings to shape decisions to buy. Recommendation engines inform the viewer driving them to purchase. These are optimised to illicit and force engagement. On Amazon this means $$$. The shaping of curation habits by various techniques is grounded in gaming and a level of fraud. Reviews are controlled some even manufactured to give desired algorithmic outcomes. The whole system is rigged and controlled by Amazon.
Amazon, and its politically leftist owner Jeff Bezos, who also bought the nation's newspaper, The Washington Post, is attempting to dictate what all Americans read, buy, eat, and how they vote.
In the process he has become the world's richest and most powerful person.
His monopoly is the real collusion.