It might be because Microsoft dislikes easter eggs in general, see https://web.archive.org/web/20171123041231/https://blogs.msdn.microsoft.com/larryosterman/200

It might be because Microsoft dislikes easter eggs in general, see https://web.archive.org/web/20171123041231/https://blogs.msdn.microsoft.com/larryosterman/2005/10/21/why-no-easter-eggs/ https://web.archive.org/web/20171123041231/https://blogs.msd... (followup to https://web.archive.org/web/20171122154012/https://blogs.msdn.microsoft.com/larryosterman/2005/10/20/early-easter-eggs/ https://web.archive.org/web/20171122154012/https://blogs.msd...).