Every big business has an in-house data centre, which is operated as a cost centre; success, for a cost centre, means delivering service as cheaply as possible. Providing an easy way for developers to spin up new databases? That would practically be an invitation to increase costs - it's the last thing they should be doing!
So when a developer from that big corporation uses AWS and encounters an environment that makes it easy for them to spin up a new database, it's a big productivity increase.