If this has been a black hat leak where someone was caught selling 300 million peoples' location data, it would have made a bigger story yes, but it would be in the same bucket as Equifax right now (and to an extent, Snowden as well).
The point is to make it public. Not claim its out there somewhere. The ability to go in and see your data just sitting there in the public is what makes it 'real' to people that don't think they care about privacy.
Imagine the chaos caused by a distributed, automated, nationwide creation of fraudulent accounts and debts being created.
It would bring the financial system to a halt until the fraudulent transactions could be identified and filtered out.