Public doesn't necessarily mean "outside my company" or "seen by anyone but you". It refers to the interface available to users (human, if it's an application,

Public doesn't necessarily mean "outside my company" or "seen by anyone but you". It refers to the interface available to users (human, if it's an application, or other packages, if it's a library). If it doesn't have a public API it's not usable by anyone and you can save time by not working on it anymore.