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https://www.semafor.com/article/07/06/2023/twitter-is-threatening-to-sue-meta-over-threads

TL;DR: Twitter's lawyers accused Meta of hiring dozens of former Twitter employees who “had and continue to have access to Twitter’s trade secrets and other highly confidential information.”
(Lawyers) also alleged that Meta assigned those employees to develop “Meta’s copycat ‘Threads’ app with the specific intent that they use Twitter’s trade secrets and other intellectual property in order to accelerate the development of Meta’s competing app, in violation of both state and federal law as well as those employees’ ongoing obligations to Twitter.”