1. Section.io expanded their infrastructure from AWS to also include Azure to gain location flexibility and avoid relying solely on one cloud provider.
2. They provisioned Linux virtual machines, load balancers, and DNS routing in Azure, which has advantages like built-in load balancer protocols and scaling capabilities.
3. While Azure has many similarities to AWS, there are also some differences in how services like availability sets, load balancing, and virtual machine configuration work that Section.io had to account for in their implementation.