> Anybody knows how has the community split between Kakoune and Helix in the end?

The two communities are mostly distinct and don't share much of the same population. Kakoune is far more niche and intimate. My understanding is that it's too esoteric for most people to bother with, whereas Helix is usually a more direct transition from something like Neovim.

Kakoune is the most fun to play with IMO. It has great concepts to learn and a genuinely refreshing philosophy. But being too different is often a dealbreaker for people. Their mental model tends to be: "Okay, visual mode by default is nice, but Helix gives me that plus everything I already have in Neovim" (aside from deep customization).