From the September 2015 developer's chat:
To be honest I'm fairly certain that there are already plenty of people who use multiple ID's in HD. Not all of them cheat, but I am worried that this update will make those that do cheat more effective. By limiting the amount of schools that see recruits, it makes it more profitable/more likely that sharing info between accounts pays off. Are there any plans to actually crack down on multiple ID users or will this practice continue to be allowed? (therewas47 - Hall of Famer - 3:44 PM)
Cheaters are going to cheat. I don't want to limit the potential of the game just to shut down cheaters. Maybe it's naive, but I like to think most of the people playing HD are not going to do that.