A TikTok video comparing a car's odometer reading history against its Facebook Marketplace listing (Image: TikTok/@matty.rio)

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Let’s talk about one of the most lucrative and widespread forms of online crime. It’s low risk, low effort but with a massive upside. The mark is a roughly $14 billion-per-year industry in Australia. The best part about it? The victims typically don’t even know they’ve been robbed. It’s pretty much the perfect crime.

I’m talking about digital advertising fraud. Those banners across the top of websites, pre-roll videos on YouTube and promoted search results? They pay for a lot of the free internet.