Well, assuming it was a DMCA takedown..
https://www.dmca.com/FAQ/European-DMCA-Takedown-processSo, yes, DMCAs can be enforced over the pond.
I also see comments about the Dev team not caring. Oh really? Is that why they plan to release the core to the community? If I didn't care about a project I'd just close up shop, throw a quickie note (much shorter, probably a sentence) and that'd be it. I wouldn't waste my time packaging the server's code up (apparently they're anonymizing the player data).
For that matter, why would they start work on a TBC realm if they were tired of it. Or a PVE realm...or the bloody AQ stuff (I hear it's a PITA with all the event scripts).
Pro-Tip: Wait till you get a C&D from a Fortune 500 company co-signed with legal firm IN YOUR COUNTRY. Noting that if you don't comply they'll be seeing you in court...lets see how you react.
And because I feel like it:
http://www.collegeart.org/ip/ip_copyright_outside"French copyright differs from Anglo-American law in its emphasis on droit d’auteur (right of author) and is defined by the Code de la propriété intellectuelle, which implements EU copyright and IP law. The term “author” is interpreted quite broadly (though some debate exists over its applicability to computer programming), and is extended to proprietary, reproductive, and performative rights as well as moral rights (which often overlap).
One striking difference of French law is that a violation of copyright or IP law is a criminal offense with very strong penalties. This has been further enforced with the implementation of Loi sur le Droit d’Auteur et les Droits Voisins dans la Société de l’Information (Law on the right of author and the related rights in the information society) (DADVSI) of 2006."
So in the immortalwords of Harry:
