As of 21/10/2026 Abuse.ch needs a API key to download their lists. News link: https://www.linkedin.com/posts/abuse-ch_authenticate-steadyplatform-steadysignal-activity-7518660733203832832-ohAX This includes ThreatFox which will not receive updates unless v2 of their URL is used. Feodo Tracker seems to not need this. But as of right now the Feodo Tracker only contains 5 entries anyway.
The ThreatFox ruleset source requires the Auth-Key now (commit ed825bc835, "ruleset-sources: Require an Auth-Key for ThreatFox downloads"), and it is not offered without it. Closing this as fixed.