More specifically, Logseq uses DataScript, a Datomic-inspired Datalog engine for ClojureScript.

Logseq does! We at Logseq also believe in giving back so we sponsored learndatalogtoday.org when it went down - https://github.com/sponsors/jonase . I'd encourage others to do the same if they appreciate the author for making datalog more accessible

They do! IIRC they were inspired by Roam’s use of it with Clojurescript