Comment by chipotle_coyote

They don't pre-populate the feed, no. I believe they suggest users to follow (on Mastodon that's a per-instance choice based on the administrator), and have sort of generic popular feeds. If you want to see what that looks like on Bluesky, just open up "bsky.app" when you're not logged in. You absolutely do not see a parade of kinky socialist furries.