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Good luck self-hosting DynamoDB and your AWS Lambdas...

There are DynamoDB Local[1] and AWS SAM CLI[2], both from AWS, which allow you to self-host DynamoDB and AWS Lambda functions. ;)

That said, I agree with your argument, but found it rather funny that you just picked two AWS services you can indeed run locally.

[1]: https://docs.aws.amazon.com/amazondynamodb/latest/developerg...

[2]: https://github.com/awslabs/aws-sam-cli/

DynamoDB is really only good for testing since it uses SQLite underneath.

These are meant for anything more than dev testing though. All the big clouds offer various dev/local versions of their hosted products that are usually just wrappers around sqlite or rocksdb to emulate the interfaces.

All the more reason for an AWS managed version of MongoDB and Knative...

The only reason that's never going to happen is because Mongo's licensing prevents it.

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