For me it’d be word of mouth and a more memorable name. It was people making posts about Lemmy over on the sinking ship that caught my attention first and kbin second. Call it lizard brain or whatever but “Lemmy” is close to “Lemmings” which is a game I loved as a child while “kbin” makes the mistake of not being a single, simple word. One sounds personalable and a finished product, the other sounds like the backend of bigger software.