“Many have been drawn to Bluesky’s […] emphasis on free expression, particularly as X scales back content moderation.”

Content moderation is a euphemism for censorship. Censorship is the opposite of free expression.

Elon bought X to cease rampant content moderation. It’s true, he’s scaling back on censorship to promote free expression.

So, because X won’t censor users by moderating oppositional partisan content, Bluesky is the best alternative for free expression, implicitly because Bluesky will moderate and censor oppositional partisan content.

You can have aggressive, partisan content moderation or you can have free expression but you can’t have both. These are literally mutually exclusive social media strategies.