@who@feddit.org : this is sadly not possible, as Anubis knows nothing about the user session or login status of the user within Lemmy (or cookies for that matter). It's a tool that does heuristic checks, taking into account e.g. the IP address, the browsers user-agent header etc. It however stores sessions it has "seen" for 12h (with its own cookie) and doesn't send a challenge as long as this is persisted.
If you're seeing the challenge multiple times a day, that this usually means that the cookie either was deleted, or the session somehow otherwise got interrupted on the client side.