If I had to guess, the bottom has fallen out of the advertising market and every business reliant on selling adverts is getting desperate.
I'm sure they will see some short term bump but I've got to wonder if this is finally the end for them. I'm certainly not bothering to check it any more.
See also: magazines, watch the signal to noise ratio plummet as they try to prop up revenue with more and lower quality ads.
I get why they do it, they are in a death spiral, desperately trying to find that one thing that will save them, mostly I think it just hastens the end as the bad experience turns people away.
The answer of course is that their only choice is to focus on their captive audience (people who can't or won't buy online) and extract as much as possible until the music stops.
A similar thing is ironically happening to Netflix
I think it's more likely the folks running the product machine learning recommendation engines are asleep at the wheel; after all, Mark lost interest in his core product to promote AR, so why would th efolks running the core product care?