Amazon, yes?
My instinct is that Evil Man theory is as simplistic (and wrong) as Great Man theory: there's probably some better explanation that this also provides evidence for, that I'm missing.
And I'm sure Jeff Bezos is so pure he'd never use his power over WaPo to help Amazon!/s
Trump sees "friends" and "enemies" [0], and doesn't care about actual ownership of shares. "Bezos is a friend and sorted out that WaPo mess, so I'll cut him some slack and kill off that Amazon anti-trust thing" is something we can all picture Trump saying.
[0] Obviously I have no idea what he actually sees or thinks, but this picture seems to match his public pronouncements.