I know you joke about looking at credit card info, but it reminded me of this story[1] where fraud researchers at a credit card company (ab)used their access to credit card transactions of their customers in order to mine the data and perform fundamental research about various companies&#x27; retail performance.<p>They then used this information to trade on the companies just before earning release, and made a lot of money. They were eventually caught by the SEC because their trading was deemed suspicious, i.e. their options bets always seemed to work out.<p>1. <a href="http:&#x2F;&#x2F;www.bloombergview.com&#x2F;articles&#x2F;2015-01-23&#x2F;capital-one-fraud-researchers-may-also-have-done-some-fraud" rel="nofollow">http:&#x2F;&#x2F;www.bloombergview.com&#x2F;articles&#x2F;2015-01-23&#x2F;capital-one...</a>