Serverless, of course, does not imply that there is no server. I prefer more the term Function-as-a-Service, but FaaS is still one method of serverless computing after all. https://martinfowler.com/articles/serverless.html The blog post is more about experimenting, and knowing how things work under the hood, and that you don't need AWS Lambda for example if you want to work with serverless, but you can do it at home with your RPi.