I use Fediverse Obsever, which, for example, shows instances that allow signups, (ex: registration is disabled for lemmy.one) but am not sure of many instances where you don’t have to type a verification (besides lemmings.world). I think it’s good to have a typed verification, I’m just wondering which ones don’t.
I know thelemmy.club is one.
lemmy.gregw.us
I do occasionally turn it on when there’s waves of spam sign ups.
But I know how off putting it is to a new user to have to wait and be approved for some site you’re not even sure you want to join.