BYJU'S Founder Byju Raveendran, while speaking to ANI, said a toxic work culture, like the one that was reported at his edtech startup, can cause post-traumatic stress disorder (PTSD) in people. "For those who are mission-driven, it'll be used to create 'post-traumatic growth'," he said. Only about 1% of 15,000 sales representatives at BYJU'S engaged in aggressive selling, he claimed.