Jesus christ, that is a lot of exchanges for sure.

I would have expected maybe 2 to 3 exchanges to go bust, max. But apparently that figure is much larger.

I guess this just goes to show how important it is to retain access to your private keys. No custodial method is going to be failsafe nor will they be able to stand the test of time - not even the ones which look invicible right now. Just think about what happened to Mt. Gox.