I'm a tech lawyer, not affiliated with either company. I think the linked article sensationalizes it and makes it a bigger deal than it is, if you read the underlying Bloomberg article it just says that Uber agreed to indemnify (defend in a lawsuit) if Lewandowski got sued over something that was in his memory. It doesnt say anything about him copying and bringing over files etc. The "what's retained in memory" issue is a pretty standard point that is negotiated in NDAs, ultimately most people agree that you shouldnt be sued for something you remember, as long as you didnt go out of your way to memorize it or write it down. Otherwise, if you learned anything confidential at a job you'd be unemployable by other companies doing similar things.