It's because corporate press releases are so lame [1]. They don't give relevant background, they're saturated with dystopian smarm ("Since our founding in 2008, we’ve been motivated by the pursuit of our mission"), and they're ultimately all about spin. I don't mean to pick on particular cases—it's across the board. You'd think the smarter people at some of these companies would realize how well they'd stand out by not writing that way, but that's surprisingly rare.

You're right to reference HN's 'original source' rule ("Please submit the original source. If a post reports on something found on another site, submit the latter." - https://news.ycombinator.com/newsguidelines.html), because this is an exception to it. The reason we have exceptions is that there's a higher organizing principle on HN, namely that we're trying to optimize the site for curiosity [2]. Optimizing means that when there's a conflict between that rule and any other rule, the curiosity rule wins.

Funnily enough the curiosity rule is an instance of itself because it often produces decisions that are counterintuitive, yet at the same time are surprisingly clear. This case is one of the clear ones—it's obvious that corporate press releases don't serve curiosity, and in fact they're largely intended to smooth away anything that people would be curious about.

[1] https://hn.algolia.com/?dateRange=all&page=0&prefix=true&sor...

[2] https://hn.algolia.com/?dateRange=all&page=0&prefix=true&sor...