For anyone interested in reading more on this type of thing, the colloquial term seems to be "SMM panel" where SMM is "social media marketing". EN Wikipedia has nothing of course, but DE has this: https://de.wikipedia.org/wiki/SMM-Panel.
Oh fuck it's spreading. I hadn't seen this pattern before until I started using LinkedIn for job hunting (it's what Australia uses, trust me I'm more unhappy than you are lol). We won't show you this job again....until the next time you're on this page again, which you'll need to check every day because despite sorting by date we're still gonna shuffle jobs you haven't seen yet inside a dozen pages of jobs you've already seen. I assume it drives "engagement" or some bullshit, hooray for monopolies! 😡
Had to make a fucking uBO rule www.linkedin.com##li:has-text(/show you this job again./)
If it were difficult or time consuming to lookup or fetch items from the cache, it's not a very effective cache 😬