My favourite was Bitomat.pl's loss of 17k bitcoins in 2011 because they restarted their EC2 instance.

I understand that the "ephemeral" nature of EC2 was in the documentation, but ESL speakers may have glossed over the significance of a word they didn't fully comprehend.

https://siliconangle.com/2011/08/01/third-largest-bitcoin-ex...