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There's one more trick. You attach a picture to the thread. Then open the picture in a new window/tab. Edit the post. Copy the URL and then link to the attached picture in your post. Save changes.
This allows those not logged in to view the attached picture because there's a link to it (even though the link is to the attached picture).
This is why you sometimes see the same picture embedded in a post but also attached to it. Whoever did that has taken some effort, albeit minor, to make the post readable to non-logged in users.
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