How often do you think about what pieces of your infrastructure are a single point of failure? This is a quote from the article.
Failure Isn’t an Option, It’s a Fact
And that is true, everything fails given some time. One of the common single points of failure in some typical web environment is the load balancers since usually is the single entry point for all the different web servers that handle the traffic.
CloudFlare is not using any load balancer in their infrastructure, and in this article, they explain how they are able to still route the traffic to the correct server without the need to have the load balancer.