Weird, Apple does a similar thing with macOS startup on Intel (and more recently, Rosetta on Linux). If the magic haiku isn’t given the OS won’t start.
http://www.rcfp.org/sites/default/files/docs/20120105_202426... is when Apple tried to get the haiku protected as a trade secret
Bonus fun fact: Once the “don’t steal Mac OS” kext is loaded, a longer poem is loaded into memory (at least, it was around Tiger):
Your karma check for today:
There once was was a user that whined
his existing OS was so blind,
he’d do better to pirate an OS that ran great
but found his hardware declined.
Please don’t steal Mac OS! Really, that’s way uncool.
(C) Apple Computer, Inc.
(https://www.zdnet.com/article/apple-warns-off-os-pirates-wit...)