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Twitter accuses Meta of hiring former staff in cease-and-desist letter
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
It's fairly ridiculous. So long as they don't take company property with them from the previous employer, there really shouldn't be an issue. Patents should be more than sufficient to protect IP. If you're concerned about someone building on that patent independently, you should probably do what it takes to keep them.