I thought photos on `https://i.sstatic.net/` weren't meant to expire? Or at least, not expire for a very long time without views?

![enter image description here][1]

It seems strange that two images on [a question][2] are gone, but one survives...


  [1]: https://i.sstatic.net/eS50N.png
  [2]: https://serverfault.com/questions/265196/speed-up-microsoft-windows-dns-server