I just saw another one in random(@kbin.social), so I jumped in and scrolled back; there were only a couple in the past two days, but three days ago there was a series of several posts in a row (6? 8? Something like that).
I an not subscribed to any kbin magazines, so I don’t see them in my curated feed; they mostly show up in the uncurated “World.”
FWIW; you expressed curiosity, so I followed up with an example.
Most of the content being federated to my instance from kbin appears to be mostly adverts for websites selling pharmaceuticals - usually advertising controlled substances.
After a couple from the same magazine(? kbin’s term?) I just block the community. But it’s pretty non-stop. I guess it’s not yet considered to be worth defederating, but yowsa.