Working around the EC2 outage 15 years ago
Choosing to be on AWS or any other cloud provider means you accept some risk of things going down. Build to fail and when that fails, it all comes down to whether or not you can do it better and how much cost you're willing to bear to get to your goal of HA. For me, I know AWS can do a better job at hosting than I can and can accept multiple AZs going down.