This was happening on the Curse Voice forums repeatedly. It was impossible to post, often. Eventually the Curse staff just deleted all the forums, which was an utter outrage. This spam detection system should not be given deletion privileges. It should flag posts as spam to learn rather than deleting posts outright.
Let's call the redirection what it's meant to be: a legal safety net. Instead of having an annoying redirection UI as a legal safety net, why not just put something like "Do you agree not to open a lawsuit due to what might be linked on our forums?" in the user agreement for registration? That's what most forums do and it's much more user-friendly.
Anyway, considering that the forum software rehosted my image, the safety net isn't even working as intended.
Oh, I thought the redirection safety was meant for censorship surrounding imagery that parents don't want their children to see, like "If you follow this link, you could go to the scary part of the internet where there's porn and gore! Are you SURE you want to do that?"