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Google, Microsoft, OpenAI and startup form body to regulate AI development
(www.theguardian.com)
This is a most excellent place for technology news and articles.
That's definitely part of it, but I suspect they realise what has come out of Pandora's box cannot be put back in. I guess you can't really appreciate how someone can misuse or abuse something until you see it first hand, there will always be things people do which defy your imagination.
I don't think they care about opening "Pandora's box" as Microsoft in particular had no issues collaborating with the Chinese military on AI research.