They are mostly interchangeable. They all store data; they all run Linux VMs. Switching costs are high though.
It's surprising that vendors make their custom cloud features (e.g. SQS) more expensive than running the same thing yourself - because those have the most vendor lock-in.
It's surprising that vendors make their custom cloud features (e.g. SQS) more expensive than running the same thing yourself - because those have the most vendor lock-in.