I used to work in engine development and calibration. There aren't many people who know how to do engine cal and it's incredibly important to get your engine emissions certified to sell in a market like the USA. The problem is that most people who know how to do it work for a car manufacturer (OEM). So when I had that on my LinkedIn I would get pretty regular messages from some consultancy or another offering hundreds of dollars per hour to chat with me about my expertise. Of course I couldn't go talk to a competitor but I'm sure a lot of engineers were happy to make a few hundred bucks chatting with some generic consultant who was writing a general industry report with anonymous data and background info.
Well the customer was usually a competitor or a foreign automaker exploring entering the US market. Everyone who could help them understand the timelines, cost, and process worked for their competitors. So the critical info got passed through consultancies into sanitized anonymized reports; laundering.
Note: I'm not sure whether talking to a consultancy would have violated my employment contract at the time but I never took the calls so I had no reason to look it up. I know that coworkers did and just called it a gray area. I pass no moral judgement one way or another.