In an (uncritical) Washington Posts Q&A, Bill Gates seems to admit that he had a ghostwriter. "He would write it, and then I would edit it."
I know, you're not shocked. But---ethically speaking---it matters. The real author's name should be on the book.
https://www.washingtonpost.com/books/2025/02/04/bill-gates-memoir-source-code/
The Washington Post · Why Bill Gates buried a headline in his memoir’s epilogue