Hi and welcome to Admissions Boards!
I think a lot of schools just send out secondaries to whoever requests them. I don’t think they want to spend any time evaluating applicants unless they formally apply. They also know that not all secondaries get returned.
If you want a more expert answer, however, please don’t hesitate to post this in the Ask AdmissionsConsultants thread. Be sure to click “Reply to Topic” and not “New Topic”
Best of luck!