"Check our Wikipedia page for our latest domain. Next stop the Central African Republic!"

It's a step up. Texas took down a Dutch porn site that way, but it was a Texas court order, not a random company sending C&D.

You don't have to fight a C&D, you can ignore it. But they may sue you and you have to fight that. But they can also sue you without a C&D or even after you comply with one. The C&D itself has no effect, but it's the equivalent of a gangster pointing at his own eyeballs and then yours, "I'm watching you."

My understanding is that copyright of what's posted is retained by the poster. The Nitter C&D was around a ToS violation for scraping.