https://tech.newstatesman.com/security/value-personal-data

In January, hackers uploaded more than 2,000 databases on to a cloud hosting service known as MEGA. The collection included 87 gigabytes of data, 21 million passwords and more than 770 million email addresses. It was the largest database of compromised login details ever to have been published.

But it held the title for only a few weeks. By February, a further six collections had appeared online, one of which, Collection #2, was even larger than the first, containing more than half a terabyte of data. However, while 140 million of the email addresses disclosed in the first breach had not been seen before, much of the data had already been circulating on dark web forums.