Images that are filtered out are still displayed as links in posts, just doesn't load inline in the post.
It's like instead of using the [img] bbcode, you used the [url] one.
Reason being that some people log what IPs request an image file.
In the case of some torrent trackers, they use that as a way to see which of their members are viewing FST (they come across post created by the tracker admin on fst, image loads (from tracker server), tracker server logs the IP that connected, looks up if that IP exists in the tracker's db then bans the associated user for being a member at fst.
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