Substack signs ex-Forbes writer as it seeks to disrupt book publishing

Substack, an online subscription platform for popular writers like Glenn Greenwald and Andrew Sullivan, appears to be setting its sights on disrupting the book publishing world.

Former Forbes media and entertainment writer Zack O’Malley Greenburg has revealed to Media Ink that he has received an advance to write a book for Substack titled, “We Are All Musicians Now.” The book will be released on Substack later this month in a serialized format — with chapters dropping once a week.