1. Broadcast what the article is about to let the interested readers find it easier
2. Trick people into reading as much of the article as possible through any means
The first makes sense if you want readers. The second makes sense if you're counting page impressions.
I feel like Gwern’s example is quite illustrative of this point. Just framing the content differently makes you more motivated to jump into it, even if you’re reading about the same content as before.
I first heard that it has a standard in an email from someone ex-military; they started the email with "BLUF: blah blah blah". Turns out the military had (has?) it as a standard for emails. Go figure.
Before then, I remember someone asking Adam Ragusea (Youtube cooking channel) why he gives away the point of the video at the very beginning. Ragusea explained that he was previously a journalism professor, and he refused to bury the lede.
I don't watch cooking content anymore, but I've remained impressed that he was able to have a Youtube career while avoiding that manipulate-the-audience behavior to drive stats.