RDS is not, by default, multi-instance and multi-region or fault tolerant at all - you choose all of that in your instance config. The amount of single-instance single-region zero-backup RDS setup's I've seen in the wild is honestly concerning. Do Devs think an RDS instance on it's own without explicit configuration is fault tolerant and backed-up? If you have an ec2 instance with EBS and auto-restart you have almost identical fault tolerance (yes there are some slight nuances on RDS regarding recovery following a failure).

Just found that assumption a bit dangerous. The ease with which you can set that up is easy on RDS but it's not on by default.