Why is port 3000 always in use?

We just shipped Dev Ports in Room Service. A new way to see and manage active local development servers across your Mac. Dev Ports brings local server visibility into the parts of the app where it is most useful: Home, the menu bar, smart notifications, Ops Feed, and the command panel. The goal was simple: make active local servers easier to notice and easier to act on, without constantly switching between terminal tabs, browser tabs, Activity Monitor, and Finder. When Room Service detects a pro