How Are You Handling CD Pipelines?

Where I work, we just roll our own CD pipeline. This is not difficult since we have created a node API to interact with our platform (for reference we are a cloud and container orchestration SaaS/PaaS). Currently, we use our node API, Typescript, Node.js, and Docker (here is a blog/video on the topic https://cycle.io/blog/2020/12/node_cd_pipeline/).

This got me wondering, how many devs and engineers created their own CD pipeline, or use a system like Jenkins, GoCD, or Screwdriver?