Part of the organizational allure of migrating to the cloud is being able to rationalize headcount. Hybrid clouds, while bringing a lot of potential upside, are complex. While you can potentially reduce the scale of labor involved, you still have to retain all of the core skillsets you already have to maintain your on-prem locations. Then add headcount to optimize the cloud deployment, _plus_ the ever elusive skillset of the individuals that can marry the two in such a way where you show operational savings from the hybrid model.
They turned on encryption for an option and did not realize the huge price difference between the encrypted and unencrypted option meant $9000 per day in additional charges. After 1 month (30 days) this came to light, and he was fired.
EDIT: btw, he was not fired for using AWS, he was fired for making unnecessary costs.
It's scarily easy to accrue huge bills if you're not watching things closely.