1) We are completely overrun by automated applications right now. We have hundreds of them. When you have hundreds of them, you can start to see the patterns, and we have very high confidence that we will weed out automated applications before the technical interviews.
2) Unfortunately, we don't have as high confidence that we won't eliminate false positives. To work effectively with hundreds of applications we have to use very broad heuristics, and we know some good engineers who would otherwise be worth a shot will likely get caught up in them. But it's better for us to not hire at all than to hire someone who applied while they were sleeping.
Because of (2), I frankly consider tools like this unethical. Yes, the market sucks right now. But it sucks in part because of tools like this. You're getting ghosted because employers can't keep up with the spam any more without using extremely aggressive filters—ours are all still manual (yes, we read every resume) but I wouldn't be surprised if this kind of behavior is turning more and more employers to the dreaded automatic filters.
Automated applications will not get you a job at a place that values its employees, because places like mine won't allow our hiring process to bring in someone who doesn't really want to be here. And what you are doing is making it harder for the people who really did look at our listing and think our company would be a good place to work to get hired at the company of their choice.