Time for some trolling. xD
Definitely doing that for Harry Potter books lol, fuck that author (she who shall not be named).
Best let them come up with the idea, then you publish it the next day, and watch the author’s reaction:
“Someone has already published a book on the same idea? Nooo wayyy!”
[Insert “U Mad Bro” Trollface Meme]
There was a theoretical one I saw ages ago that was a giant cylinder rotating in space at close to the speed of light that had this limitation. I remember exactly zero details beyond physically what it was in the phrase “time cone”.
Seems like it’s probably the Tipler Cylinder