[rocqua]

Note, not just the original listing has been taking down, but also the data used in the challenge. I believe because a few people in that set actually got de-anonimized. But certainly because of privacy concerns.

I think the data is still kicking around somewhere in torrent land. I also still have my own copy somewhere, I think.

[Delk]

IIRC it had something to do with researchers being able to statistically identify Netflix users by using IMDB for comparison.

A Wired article from 2010 [1] suggests it lead to some legal liability risks for Netflix.

[1] https://www.wired.com/2010/03/netflix-cancels-contest/