Side comment, not reflecting on DAN ot instructors in particular, but life in general.
Scuba divers, as a class, include a disproportionatly large number of iconoclasts, it's a sport that attracts folks not prone to group-think.
While DAN is a worthwhile organization (yes, I'm a member) with worthwhile programs including insurance for dive accidents, individual instructors may have what they feel are valid reasons for not signing up their students, beyond the laziness or ignorance that the tone of OP inplies.
Not signing folks up for a FREE offer doesn't automatically mean you're somehow shortchanging them.
Again, I'm not referring to the DAN offer in particular, but commenting that we should respect individual decisions, and that nobody needs to justify theirs to anyone.