Comment by omoikane

It sounds like you are asking whether anti-cloning or anti-piracy measures would survive in today's world, and that's something of an ugly arms race. The publishers know whatever scheme they put in will eventually be defeated, but most of them just want to deter piracy for a limited period after the release date.

The Microsoft easter egg is from an earlier era where things aren't so ugly. The Cutting Room Floor has more easter eggs of that nature, for example:

https://tcrf.net/Super_Tetris_3

Also try searching for "hidden copyright".