> Several years ago, the process of almost any online application realized a 90%+ non-response rate
Back when I was trying to land my first job, I replied to help wanted ads in the newspaper. (Yes, it's been a while.) What I remember of that was that the response rate was not much better in those days.
That's not to say that it's any less frustrating today than it was then, but the cost of the search (in actual out-of-pocket expenses) has decreased a good bit.