I think it's because the tech industry is positively lousy with deluded persons who see themselves as embryonic billionaires. When you believe your asshole sprays gold coins every time you update a git repo, you tend to overlook that production is arranged under capitalism to have the ownership class expropriate the majority of the value that workers create.
Lets Occam's razor this shit. Is Amazon a megacorp with the ability to throw their weight around and have a large impact on the world? Or are they a little mom-and-pop operation that have wondered into the crosshairs of newsmen conspiring against them because Bozos is the owner of a rival paper? In an era where NYT would like nothing more than to stop the bleeding from papers to online, and migration from NYT to Wapo isn't even on their radar?
I think the Times is awful, venal, half tabloid, and generally doesn't go after the powerful enough, but I don't think they look at WaPo as 'rivals.' They're basically the same thing, owned by a different set of oligarchs.
These days the NYT is doing some very biased reporting.
If you read the NYT it is at the very least staunchly moderate on capitalism, if not (in my opinion) a doggedly fierce advocate for it, especially at a time when much of its readership is pushing to the economic left.
These moves kind of smell of ideological possession to me.