CNN — Substack has removed several publications for inciting violence, the newsletter publisher said in a statement shared with CNN Tuesday, as writers from across the platform threaten?ed to quit over the presence of pro-Nazi content. After Casey Newton, founder of Substack tech news publication Platformer, flagged a list of publications violating content guidelines to the company, Substack says it is removing five. None of the nixed newsletters have paid subscribers and, in total, account for about 100 active readers, according to the company. The decision to remove the content could represent a change of heart for Substack, a subscription...