The important part on mastodon is that you have the choice to join whatever place you want, look at the stuff you want, have moderation as much or less as you want and cant be forced to anything really.

The fedi in total is about freedom, not privacy. Privacy in public posts is pretty much nonexistent. The only "privacy" argument i can think of is you cant be forced to link accounts and you can make thousands which makes it hard to grasp who you are today.

Still a vastly better idea than bluesky.