The hub is certainly doing switching if not routing between multiple point-to-point networks. If this is layer 3 routing than "internet" is a fair term. Even

The hub is certainly doing switching if not routing between multiple point-to-point networks. If this is layer 3 routing than "internet" is a fair term. Even if it is layer 2 switching, "internet" isn't too far off the mark. On the other hand "Internet" is not correct at all since that is one particular "internet" distinctly different than the internet described in the article.