Public as in being visible to all is not the same as public as in allowing use by all. You appear to be conflating the former definition with the latter. For example, my front door is visible to all, but a person isn't allowed to walk into my house without permission.
Public as in being visible to all is not the same as public as in allowing use by all. You appear to be conflating the former definition with the latter. For example, my front door is visible to all, but a person isn't allowed to walk into my house without permission.