Has anyone seen Michigan's One More Year Fund? It is a crowdfunding NIL campaign designed to retain key Michigan football players and this has already benefitted with 4 key players returning including Blake Corum, Cornelius Johnson (caught 69 and 75 yard touchdown passes against us but probably needed another year anyway), Trevor Keegan, and Zak Zinter (no. 3 Guard on Kiper's list). 

You can see the website here and that they have already raised over 103k in donations from just 997 supporters.