“Mbin” literally stands for “magazine bin” though. The use of “magazine” is a gun pun carried over from kbin. Kbin was named after the karabiner rifle, which, somewhat ironically, doesn’t use magazines, but it’s still a gun thing.

The true format-agnostic platform would be named something like “gbin” because ActivityPub calls communities/magazines “groups”. That could be a throwback to Usenet, but it’s a fairly generic term.

… although that being an anagram of “bing” might raise a few eyebrows at Microsoft legal.