The submitted title deviates from that of the linked post ("Do we fear the serializable isolation level more than we fear subtle bugs?") and, having read the source, I'm not even sure if it's even close to accurate...
Because, even having re-read the article you linked, it does not support the conclusion that "[an] exchange[...] was totally ruined because of [weak isolation]" at all?
The goal of the post is to highlight this problem, as cited research papers clearly demonstrate that such issues occur more frequently than commonly perceived.
Again, I'm sorry that the title might be misleading and you have expected a different content.
[0] https://hackingdistributed.com/2014/04/06/another-one-bites-...
[1] https://www.reddit.com/r/Bitcoin/comments/1wtbiu/how_i_stole...