Well sure then let's break it down. Assume I have an open role for a small business and I get 500 applications to sort through. The first step is most businesses will use at least some sort of filtering for the basic requirements to determine good fit. So those are pretty easy to sort through. Let's assume I cut those applications down to 50 that actually fit my requirements.
Now am I supposed to bundle up all those 450 initial applications that got filtered out just to send them a nice polite email that their resumes didn't even fit the position they applied for? From a pure business perspective this is a straight waste of time. Especially as most businesses aren't going to have an automatic way to do this easily, and building that automation doesn't make my company money. But if I already happened to have some automation setup for it, then maybe sure. This part is the majority 'ghosted' applications. For the rest of the 50 I'd probably be more likely to actually send them a personalized email about the role because at least they actually fit what they applied for.
Now am I supposed to bundle up all those 450 initial applications that got filtered out just to send them a nice polite email that their resumes didn't even fit the position they applied for? From a pure business perspective this is a straight waste of time. Especially as most businesses aren't going to have an automatic way to do this easily, and building that automation doesn't make my company money. But if I already happened to have some automation setup for it, then maybe sure. This part is the majority 'ghosted' applications. For the rest of the 50 I'd probably be more likely to actually send them a personalized email about the role because at least they actually fit what they applied for.