I can’t answer, I guess it depends on the contract. But it is very clear this book is being panned widely as complete crap so can’t see it taking off.
I watched the sky Australia review of it a pp linked, and they ripped the shit out of it, garbage, catastrophe, crap, lightweight, being some of the words used .
They are very clear though they think harry, and more particularly Megan are the ones behind it, and that scobie is just their mouthpiece, he’s just the face of it. It’s their book. If they are right, it explains why harry and Megan are silent.
but yes it looks like the book is a badly written dud, just more garbage.