I know antitrust covers more than just the classic case of monopolies driving up consumer prices. But looking at it just from the anti-consumer lens, the case against Amazon really is kind of funny, when they're at the same time blamed for pushing prices down so low that that the fed uses them as a possible explanation for low inflation [1].
[1]: https://www.cnbc.com/2018/03/01/new-fed-chairman-says-amazon...