I mean this is because of a technical issue likely on Kbin's side. Which is not a shock.
Also I posted 2 threads to kbin communities recently, 1 got most of its activity from LW and the other got 4 favorites from different instances and no comments (and it did not federate to LW, though I don't think that was related to the temporary block). LW could be too big but kbin seems kind of dead for the communities that aren't constantly in the feed (likely because of the same people posting, in many cases). Though technical issues always could be part of it in one way or another.