Cool to see #loops starter kits evolve fast. Some quick notes @dansup - and I'll start wth maybe a touchy one: I do think you should consider makng them "opt out" rather than opt in.
This kit which I did as an experiment is still only 2 opted in users: https://loops.video/starter-kits/eD7Lkwxplw/guardians-of-the-fediverse
(I know some of that is server compatablity but I don't think all)
Secondly: "Use Kit" from a UX perspective is a bit vague, I THINK it means "follow all" but not 100 percent sure. Even after clicking on "use kit."