I don't see what this got to do with this hack. URL Hijacking like described there is about links TO your site. What this hack does is nothing more then prefixing all OUTGOING links posted at your board with a configurable prefix. If this prefix is set to one of the sites that offer an anonymiser service it will just call that site. Standard vBulletin will anyway open external links in a new window, so i don't see what harm can be done. But ofcourse i don't know what each website that offer this service is doing.
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