https://www.on3.com/teams/michigan-wolverines/news/michigan-football-what-kind-of-advantage-does-sign-stealing-give/
Or that the Big10 is out to screw NU, but then read this. Also Bolded part of the quote. And added a second to ba k up you comment.
“I actually spoke to a Big Ten source, who gave me a quote — if other people are out there sharing anonymous quotes and these ESPN and SI articles, I can too. So, here is what I learned, ‘Every Sunday, coaches and support staff with mutual connections throughout the conference contact each other to trade not just schematic notes, but also to trade signals. Some of the top teams who consistently trade signals and have very accurate information on common opponents are Michigan, Rutgers, Ohio State, Indiana, and Purdue. Other teams who are decent at it and would always look to trade are Illinois, Northwestern, Maryland, Minnesota, and Penn State. Wisconsin was oblivious to it but is likely no longer with the new staff.
Michigan State, Iowa, and Nebraska appear to be oblivious and out of the loop.’
“The other note I wrote down from my conversation, ‘Each team knows who each team’s person is, and they have their phone number.’ So, this is a pretty common practice, and clearly this also suggests that teams aren’t necessarily as afraid of Michigan as they are publicly proclaiming — or, I should say, anonymously proclaiming. This gives credence to, ‘Michigan is annihilating everything in its path. What can we do in order to kind of keep Michigan from achieving its goals?’”