There's a lot of misinformation circulating that obscures or softens Jack Dorsey's relationship to #Bluesky, Bluesky to Twitter, &/or Dorsey to Musk/Twitter.
On Dec 11, 2019, Dorsey announced on Twitter that he'd started Bluesky as part of Twitter, to serve Twitter, & funded by Twitter $, "to develop an open & decentralized standard for social media." (One already existed. Clearly the goal was one he controlled.)
"The goal is for Twitter to ultimately be a client of this [Bluesky] standard."