No they don’t. That is an opt-in setting that a user can put on their profile to only have logged in users see their content. The default is open viewing.
>>allthe+(OP)
Ah ok, I don't use bsky much but I got linked there on another HN post. I could see that but when I clicked on replies I got a login prompt just like twitter.
I normally use nostr more because that really is decentralised. Also mastodon. Though I don't like the short message twitter style blogs anyway. So Lemmy really is my favourite (too bad about all the tankies though)