10/22: CBS Evening News: Why is an Amazon Web Services outage able to disrupt vast parts of the internet?

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Why is an Amazon Web Services outage able to disrupt vast parts of the internet? 

https://www.youtube.com/watch?v=vrg6mY5fYwo 

https://www.youtube.com/watch?v=s567jUtkgEU

https://www.youtube.com/watch?v=KFvhpt8FN18