As you noticed, I had to temporarily enable DDoS protection. Someone is trying quite effectively to distract me from my activities ;p Unfortunately, this may cause some issues with the federation. I will try to cut off the traffic as soon as possible and return to normal operation. Thank you for all your support and patience! :)
Another explanation, also valid: /kbin is also like a bookstore - with people being able to create their own magazines (or even newspapers), consisting of long-form articles, but also of short notes (fitting a toot on Mastodon). And it contains also magazines from other bookstores, as they collaborate with /kbin. And people are able to write their own pieces on every magazine, not only these, which they own!
I loved magazine name of “subfeddit” since first sight, and now, I love this dual meaning even more!