Its just licensing issues, the universities that haven't officially signed on are trying to see legally if they have their bases covered to ensure that they dont face another lawsuit from players.
This isnt supposed to use players likeness, and you wont be able to tell who a player is by their stats.
Like if you had say Josh Allen from a couple of years ago at UK, you couldn't scroll the OLB/DEs and see a 99 rating and rename the player Josh Allen. The rosters will be mixed. So you might have a star RB, who ends up being a star DB just because of the former lawsuit. They will rate the roster based on the talent available, but then mix that talent up to avoid any issues.