That is a common misconception.I doubt they actually did the paperwork to copyright their work.
You do not need to file for copyright to enjoy it.
Most countries are signatories to the Berne convention; those with the power to police the internet certainly are.
The Berne Convention introduced the concept that protection exists the moment a work is "fixed", that is, written or recorded on some physical medium, and its author is automatically entitled to all copyrights in the work and to any derivative works, unless and until the author explicitly disclaims them or until the copyright expires. A creator need not register or "apply for" a copyright in countries adhering to the convention.