Not their wheelhouse. And I'm not being sarcastic. It's between private individuals/businesses and the athletes. Attempting to police it would be a nightmare. I believe that once the government forced it on them they threw up their hands and said, "You want it. You got it. Have fun. We didn't want it, so we're not dealing with it."
When it was first being pushed for, I thought it would be very much like it has been with regards to recruiting. I didn't anticipate the transferring, but that was before the 1 year sit out rule was lifted. With that gone and the portal available, this is as surprising as the sun coming up tomorrow.