Blanket rejections are an extremly efficient measure from the perspective of an entity when the consumer has nowhere else to go and you don't care about ethics. Just tell them no and many people will just give up. If they appeal, you can invest the work to fob them off properly or just pay and not deal with the hassle. I can barely tell the difference with the many public healthcare insurers in germany - if my insurer were to try this nonsense, I would be gone the next month. Universities, some agencies and especially the god-damned GEZ on the other hand...
What frustrates me more, is that it often turns into a class indicator: Do you know how to word your letters or to handle yourself in a way that indicates, that it will be more annoying to not-deal-with-you than to deal-with-you? And if you don't: Do you have a access (network/money) to someone who does?