Perhaps because it prominently says that it isn't even a license at all? It is just a made-up term/category to identify licenses that restrict direct commercia

Perhaps because it prominently says that it isn't even a license at all? It is just a made-up term/category to identify licenses that restrict direct commercialization of software. Like how "open-source" isn't a license by itself, but a reasonably-shared understanding about software licenses with some properties.