The sudden departure of Twitter executives tasked with content moderation and brand safety has left the company more vulnerable than ever to hate speech. On Thursday, Twitter's vice president of trust and safety, Ella Irwin, resigned from the company. Following Irwin's departure, the company's head of brand safety and ad quality, A.J. Brown, reportedly left, as did Maie Aiyed, a program manager who worked on brand-safety partnerships. It's been just over seven months since Elon Musk closed his $44 billion purchase of Twitter, an investment that has so far been a giant money loser.