I can definitely understand where you're coming from. It seems impossible to me to figure out what these admission committees look for in applicants aside from the hard figures (GPAs, GREs, LOR, experience, etc). I would be upset too if I found out they were reaching out to other applicants, but at the same time they have the prerogative to do just that (unfortunately for anyone who may have been denied/waitlisted even if they met the minimum requirements).
I would think they do their best to fill all seats in each cohort so eventually they may have to "settle" with the applicant pool they have or reach out to applicants for other terms like they've been doing. I think making sure applicants in each cohort will make it through their program and eventually pass the NPTE is of top priority for the programs. But then again, it's anyone's guess.