I work for Amazon Web Services, and I will risk responding to the first and only comment from a brand new account.

Amazon does contribute back and does interact with open source communities. You can find information on AWS's open source activities here: https://aws.amazon.com/opensource/

The page hasn't been updated for some of the latest news, such as releasing the Firecracker virtualization technology as open source: https://firecracker-microvm.github.io/