I’d love to jump in here with a big active list, and I am actually subbed to quite a lot of Kbin magazines, but the problem is as you say, it just didn’t really take off in the same way Lemmy did. Almost everything I’m subscribed to there, despite making a good go of it in the very early days, is now dead.
Unfortunately a big part of that is because during the busiest part of the migration, there was an issue on Kbin where Ernest had to (if I’m remembering this correctly) enable some kind of Cloudflare protection that had the side effect of completely breaking federation between the two platforms. By the time it came back up and we could access Kbin mags again, due to the massive influx of people on Lemmy those communities had mostly settled here instead.
Given that there are still federation issues to this day as well as the moderation issues (I see Ernest’s reply in this thread and honestly very much respect how hard he’s been working, but factually these are still problems), I just don’t think it makes sense for people to be trying to build magazines there IF they’re wanting the maximum numbers. Obviously if you’re more interested in attracting Kbin folks than Lemmy, then it makes perfect sense.
Anyway here are some I’m subbed to, it doesn’t hurt to add to your sub list even if there are more active Lemmy duplicates, but yeah there’s not much there for some of them :(