Fake accounts? You sure?
Even more curious, when the team tried to track down the owners of the exposed email addresses, they got few responses, indicating the vast majority were fake accounts.
Sounds a tad hyperbolic. Perhaps equally likely is these days fewer people respond to emails along the lines of "Your account has been hacked. Please confirm your email address." or however their "tracking" effort went, thus severly limiting responses from owners of exposed email addresses.