To add some more antecdotal context to the Greek life aspect of all this, I was in a fraternity at what seems to be a similar school and graduated in 2018. There were tons of rules regarding what we could and could t do socially: every official party had to be registered with the school, no kegs were allowed at parties, we were supposed to be carding everyone and only serving alcohol to those over 21, etc. My fraternity was put on probation a multitude of times and the way the school found out about infractions was almost always public social media posts. In example, a picture with a keg next to our fraternity letters. What I’m getting at is that I don’t totally buy the whistleblowing theory. I doubt their sororities were put on probation for anything particularly scandalous. Could be something as simple as one of the girls getting alcohol poisoning at a registered function and having to go to the hospital. All of this is imo, of course.