Reporter Casey Newton takes more than 170,000 subscribers elsewhere over company’s failure to police extremist content

Platformer, a prominent tech newsletter founded by the veteran reporter Casey Newton, is leaving Substack over the company’s failure to police extremist content.

In a post explaining the decision, Newton said his team had identified seven Substack publications “that conveyed explicit support for 1930s German Nazis and called for violence against Jews, among other groups”. He said after weeks of back-and-forth discussions with company leaders about their “laissez-faire approach to content moderation”, he decided to part ways with the platform.