Spammers and hackers have for years seized on stolen data for corrupt means, but they are now being joined by legitimate companies spying a chance to turn the sensitive data into lucrative new customers.

As data breaches have increasingly taken aim at banks, insurers and individuals, a cottage industry of enterprising start-ups has boomed, moving quickly to target the victims left most exposed in the aftermath.

Calling itself the "Uber for private investigators", a new site had seized on the stolen data, building a search tool that allows anyone to see whether an email address was included in the embarrassing Ashley Madison breach.

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