1. they can transfer immediately once and lose no eligibility
2. they can make money off endorsements
3. insurance after college
4. And this is big one in my opinion, they ca return to school if they are not drafted
there are obviously more details so read the article
https://www.espn.com/college-sports/story/_/id/30957361/bill-introduced-sen-jerry-moran-allow-athlete-endorsement-deals