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US Govt Speeds Up Export Restrictions for Nvidia's GPUs
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
They have jurisdiction over companies based on the us and can punish them for the actions of their overseas interests.
They have derivatives of certain chips for the Chinese market only. They must have clauses to pre-empt such actions.
If the government decides to restrict exports of something this trumps any and all existing contracts regarding the now restricted thing.