Iowa State fan here... just putting in my 2 cents.
I feel the same way James does above... But first, a couple of clarifications...
1. Nothing absolves the gambling. It happened, they got caught, punishments were doled out. Players knew the rules. In fact, I believe (at ISU at least) the athlete has to sign a compliance understanding waiver. There are mandatory seminars on what is OK to do and what is a no-go. All athletes in all sports go through this.
2. Tom has the DOJ confused with the Iowa DCI (Division of Criminal Investigation). The DCI were the people that kicked this off. Nobody seems to know what started it. THAT'S WHY BRANDS WANTS THE MEDIA TO ASK THE RIGHT QUESTIONS. I agree with him. Lots of rumors, but nothing that has come up in court yet. Rumor #1 was that it started with the Iowa baseball team. Mom of an under aged player thought somebody had hacked her Fan Duel account or whatever and reported it.... etc. lots of rumors.
3. We do know that as a result of a "tip" at one University, where the DCI found evidence of underage gambling, they expanded their scope to a second University to look for more underage gambling. Makes sense right? DCI is all about underage gambling enforcement. So they put up Geofences around various athletic facilities. Can't speak for Iowa, but at ISU it was our football complex and Leid rec where wrestling is. Nothing around anything else. UNI, Drake, Simpson, etc... didn't interest them. No more fences.
4. The DCI is a criminal investigation organization. Has NOTHING to do with NCAA rules. If the motive was to catch random underage gamblers, then i don't believe them. That may be where they run into trouble in court. What they found out vs. what they told/charged people with will be telling. No to mention the number of cell phones that were acquired without warrants. Granted, if a person willingly grants access to said phone a warrant isn't necessary. I'll bet that will also be contested.