It's not following users in the same way you'd follow communities though - other users have a 'bell' icon in their profile, and if you click that you get notified when they make new posts.
If you want to follow users in the ActivityPub sense, and have their content appear in your feed the same way that new posts in a community do, you'd need to use a platform geared up for it (e.g. MBIN, Mastodon, etc).