It was easy to view Substack's 2023 Nazi controversy as a kicked can that could turn up again. Well, white supremacist content led to another headache for the company this week. User Mag reported on Tuesday that the app sent a push alert to some users promoting a Nazi newsletter. The company told Engadget the notification was an "extremely offensive and disturbing" error.<br /> The Substack newsletter in question describes itself as "a National Socialist weekly newsletter." It includes "opinions and news important to the National Socialist and White Nationalist Community." The far-right blog has a mere 757 subscribers. (That's a drop in the ocean compared to, say, Heather Cox Richardson's 2.6 million, George Saunders' 312,000 and Kare [...]