Today, it's Amazon, a monopolist with unlimited access to the capital markets and a track record of treating publishers "the way a cheetah would pursue a sickly gazelle":
https://pluralistic.net/2023/07/31/seize-the-means-of-computation/#the-internet-con
Monopolies are like Pringles (owned by the consumer packaged goods monopolist Procter & Gamble): you can't have just one. As soon as you get a monopoly in one part of the supply chain, every other part of that chain has to monopolize in self-defense.
5/