What year did you receive the cease and desist and was it from Brinks Hofer / Brinks Gilson & Lione?
So, I just had a look: Oct 2013, processed by a local attorney (Vienna/Austria). This was following to the page gaining some traction and popular attention in Japan. (Without intending any interpretation of this: I believe, in principle, you have to defend a trademark in order to uphold the rights – and at this point it was well in their radar.)
(I learned this the hard way: I once had a rather poplar 404 page featuring a variant of the game [1], until I received a cease and desist letter from Taito…)
[1] Compare: https://gizmodo.com/this-space-invaders-404-page-is-the-funn...