This NY Times article that got a fair bit of attention a couple years ago details just how shady it is:
https://www.nytimes.com/interactive/2014/08/15/magazine/bad-...
I'd be surprised if this article didn't get discussed here on HN at the time.
https://www.nytimes.com/interactive/2014/08/15/magazine/bad-...
I'd be surprised if this article didn't get discussed here on HN at the time.
(or if not, it's very helpful and worth a read)