Ah, you mean the instance where a publisher would install this plug-in. I see, well that would be supremely dumb of such a publisher, but I don't think this plug-in is aimed at publishers to commit click-fraud. I thought you meant fraud on behalf of an ordinary user, your comment made no mention of publishers.
Well I mean in addition, if you work for a competitors company, if you yourself are an advertiser in any capacity etc. There's many scenarios where you could find yourself in trouble.