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]
That’s kinda why I think time travel is impossible, if it is ever invented someone will go back and invent it sooner, then someone will go back again until eventually it ends up being the first thing ever invented by humans.