What makes you think his promotion of the book was particulary motivated by making money rather than any other reason an author might promote their book?
a) extremely passionate about the idea that we have no free will
b) loves the paychecks that arrive after appearing on podcasts and selling books
c) is compelled to do all these things because he has no free will
edit: formating, code blocks don't work anymore?
Sound depressing, but that gives us incredible freedom to investigate causes of human misery and correct them.