In my experience services aren't failing due to a lack of redundancy but due to an excess of complexity. With the move to the cloud we are continually increasing both redundancy and complexity and this is making the problem worse.

I have a cheap VPS that has run reliably for a decade except for a planned hour of downtime. Which was in the middle of the night when no-one cared. Amazon is more reliable in theory. My cheap VPS is more reliable in practice.