and Zulip has a "public access" view, which I wish more open source projects would adopt (:eyes: kubernetes.slack.com) since it allows search engines to index into the threads: https://zulip.com/help/public-access-option
> Web-public streams do not yet support search engine indexing. You can use zulip-archive to create an archive of a Zulip organization that can be indexed by search engines.
https://github.com/zulip/zulip/issues/21881 is the issue to track for the native search indexing feature.