How are y’all getting rejected/wl from every school?

Tbh I’ve been seeing posts like this more and more where ppl are saying that they got rejected or waitlisted from all the schools they applied to and only have Ivy’s/t20s left that they know they wont get in to. I’m just so confused by this, did you have an inflated perception of your stats? did you not research the average stats of admitted students? did you not go over it with anyone? not even a counselor? not even youtube. Im not saying this as an insult but as a genuine question, it just baffles me. I hope it works out for you guys tho.