The San Fransisco Aviation Museum (known as the SFO Museum / https://sfomuseum.org) has launched a massive initiative to federate their whole archive into the #fediverse! They have gone so far as to write their own #ActivityPub software in #Go suited to their needs and open sourced it (https://github.com/sfomuseum/go-activitypub). And have already launched thousands of automated accounts that cover different parts of their collection.
https://millsfield.sfomuseum.org/blog/2024/03/12/activitypub/