Some previous discussions:

https://news.ycombinator.com/item?id=19367916

https://news.ycombinator.com/item?id=25313010

https://news.ycombinator.com/item?id=39600810

https://news.ycombinator.com/item?id=41509713

https://news.ycombinator.com/item?id=46732213