Credit score vs. credit history--an issue for our kids?

^^The federal Credit Card Act of 2009 mandates that you must be 21 or have a full-time income to get approved. The tightened rules mean most college students can’t qualify for student cards on their own.

Still can’t figure out how D3, at the age of 17 in 2014 was given a cc by Wells Fargo. I believe D2 received hers from WF after 2009 also. All has worked out well but I’m wondering if there’s some loop hole to this mandate.