I’m not buying that. Lambda is merely an execution environment. In most Lambda functions I write, the Lambda-specific bit is tiny, and could be easily replaced

I’m not buying that. Lambda is merely an execution environment. In most Lambda functions I write, the Lambda-specific bit is tiny, and could be easily replaced without affecting business logic. On the other hand, most Lambdas I write interact with other AWS APIs, which is where the real lock-in is. The effort to eg. move the data off Dynamo is substantially higher than what’s required to switch that bit of code to run on k8s and consume a Kafka topic.