In the age of DevOps, it's not hard to configure different providers. I have been using Linode and DO for a while now. I noticed DO go down last week, checked my site, and it was UP because it was being served via Linode.
I flinch every time I hear someone say to me that their service has redundancy because they use multiple Amazon regions. Multiple providers people! And preferably multiple providers in multiple states, paid for by mutually exclusive credit cards!
Redundancy doesn't mean having multiple hosts by the same provider, within the same data center, within the same rack, provided by the same power strip.
tl;dr: Plan for outages.