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Once worried about AI’s potential to end the world, OpenAI CEO Sam Altman now jokes his biggest fear is the misuse of grammatical tools, specifically em dashes. This apparent change in perspective comes as OpenAI’s valuation reaches an estimated $500 billion. Earlier online forum posts, such as one found on Reddit (https://old.reddit.com/r/artificial/comments/1ne4fz6/before_openai_sam_altman_used_to_say_his_greatest/), show a stark contrast between Altman’s past anxieties regarding AI’s existential risks and his present, more lighthearted concerns.