“Corporations are evil, we can’t base social media on it”
BlueSky is literally the same form of company that Mastodon is: a public benefit LLC.
(BlueSky is a Oregon PBLLC, Mastodon is a German gGmbH.)
ActivityPub (used by Mastodon) is a W3C recommendation, available to use by anyone without charge (basically: do whatever).
The AT Protocol (used/developed by BlueSky) is permissive open source and uses the MIT license (basically: do whatever).
¯\_(ツ)_/¯