No need to feel bad, it's a great product! I've been using Azure DevOps for a while now, and it's what I use for anything not OSS (I prefer GitHub for that, and TBH it's what others expect)
It's also interesting how much Open Source is moving to Pipelines for just build services, regardless of where their code is hosted. The Python setup on Pipelines is really cool to dig into if you get the chance. I believe Python has been using it as the primary CI for their GitHub repo for bit now, and from what I've heard they've looked into using Pipelines to support a test matrix nearly as robust as their older BuildBot config.