Schools aren't supposed to be involved in making the NIL deals or providing or setting up agreements with agents. The U has contracted with companies to provide information to the students on what is and isn't allowable under the rules (e.g. you can't wear your licensed Gopher gear, you can't endorse an alcohol product), to help them raise their public profiles (e.g. they make game photos of the players available to post on social media to try to generate more interest in those accounts) and to make sure they know how to handle NIL business (e.g. you can hire an agent to assist with finding and signing deals, you have to report your income). The collectives have become one way for student-athletes to try to manage all of this.
The U is expected to monitor NIL agreements for compliance, but not to broker arrangements. I believe it is within the rules to tell a prospective student-athlete that "85% of our volleyball players have NIL deals in place" but not that "we can get you NIL deals worth $25,000 the day you commit."
Of course each school is interpreting all of these rules independently and has its own comfort level for what is "fair" under those interpretations. Added to that is the fact that there is little to no enforcement mechanism in place to police any of it.