tl;dr: Meta's engineering culture has rapidly deteriorated since April 2025 after leadership forcibly reassigned 30-50% of engineers on core teams (~6,500 people) to data labeling and RLHF work for AI training, mandated keystroke/mouse tracking, and began measuring AI token usage in performance reviews. The changes—driven by Mark Zuckerberg and Scale AI's Alexandr Wang—gutted infrastructure and security teams, leading to a major Instagram account takeover exploit, the CISO's resignation, and a mass exodus of tenured engineers. The author argues this reflects a broader "AI psychosis" among tech leaders who are sacrificing engineering quality and culture in the rush to chase AI.