[mmahemoff]

If they didn't acknowledge the well-known risks and how they got around them, they will have some concerned customers and questions from regulators.

http://en.wikipedia.org/wiki/AOL_search_data_leak

Robust De-anonymization of Large Sparse Datasets http://www.cs.utexas.edu/~shmat/shmat_oak08netflix.pdf Regarding Netflix's competition: "We demonstrate that an adversary who knows only a little bit about an individual subscriber can easily identify this subscriber’s record in the dataset."