One more essential problem is an extraction of the personal information.
No wonder, cause as big data stands out as one of the core foundations of future corporations, the actual kind of personal information that corporations collect as well as the amount of personal information is increasing.
I have heard about few examples of such an extraction. Verizon, which took over the Internet part of Yahoo in October of 2017, later revealed that about 3 billion user accounts were hacked due to a hacking incident in August of 2013. Tumblr and Flickr, which were owned by Yahoo, were hacked as well. Moreover, Oracles payment-related subsidiary firm, Micros, was also hacked for its user information, and Linkedin announced that password of 6.5 million users were hacked in 2012.