Nope, no goal posts were moved, Wikipedia and GitHub are both private entities that offer privately funded free services to everyone, and due to the widespread free access, both have been considered to be examples of digital commons by others. I didn’t make up the Wikipedia example, it’s in Wikipedia being offered as one of the canonical examples of digital commons, and unfortunately for you it pokes a hole in your argument. If your ‘book’ disagrees with the WP article, you’re free to fix it (since WP is a digital commons), and you’re also free to use it to re-evaluate whether your book needs updating.

You seem to be stuck on definitions of ‘commons’, and unfortunately that’s not a compelling argument for reasons I’ve already stated. Also unfortunate that there are fundamental terminology flaws, or made up definitions, or straw men arguments, or incorrect statements, or opinions in every single item you listed.

“Tragedy of the Commons” is a phrase that became an economic term of art a long time ago. It’s now an abstract concept, and gets used to mean (as well as defined by) any situation in which a community of people overusing shared resources causes any loss of access to those shared resources for anyone else in the community. “The tragedy of the commons is an economic theory claiming that individuals tend to exploit shared resources so that demand outweighs supply, and it becomes unavailable for the whole.” (Investopedia) I’ve already cited multiple sources that define it that way, and so far you’ve shared no evidence to the contrary.

There are also tons of examples online where the phrase has been used to refer to small, local, or privatized resources, I found a dozen in like one minute, so I already know it’s incorrect to claim that people don’t use the phrase in the way I’m suggesting.

Even though the phrase does not depend on any strict definition of commons (or of tragedy), none of your argument addresses the fact that what’s common in, say, Germany is not freely available to Iranians, for example. Land is often used in ‘tragedy of the commons’ examples. Hardin’s original example was sheep grazing on “public” land, and yet there is really no such thing as common land anywhere on this planet, all of it is claimed by subgroups, e.g., countries, and is private is some sense. The idea of commons, and even some of the alternate dictionary definitions, make explicit note that the word is relative to a specific community of people. Nothing you’ve said addresses that fact, and it means that ‘Tragedy of the Commons’ has always referred to resources that are not common in a global context. GitHub and Wikipedia are more common than “public” land in America in that global sense, because they’re used by and available to more people than US land is.

What I can agree with is that it’s common for people to mean things like land, air, and water, when using or referring to the phrase, and I agree those things count as commons.