The only way to prevent this from happening is by using a whitelist like you said. This goes for all hyperlinks and all embedded media. You'd have to hook into one of the postbit hooks and check the post contents for any URL's and replace them with something else.
Just keep in mind that you have to do this for signatures and private messages as well, and possibly a chatbox if you have one.
09-05-2016, 08:54 PM
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