you don't need to maintain servers at many modern cloud/PaaS providers. It looks like Firebase forked a generic node.js app (https://github.com/anantn/gupshup

you don't need to maintain servers at many modern cloud/PaaS providers. It looks like Firebase forked a generic node.js app (https://github.com/anantn/gupshup https://github.com/anantn/gupshup) that could run on any node.js-compatible platform, and modified it into a Firebase-only app. "serverless" is not the right adjective for that change, really.