You're not getting that many fantastic developers applying for your jobs. You're getting mostly average ones. Your process should be able to handle not throwing away qualified average candidates.
Candidates are judged relatively, not absolutely. Doesn't matter whether I'm hiring PhDs to write neural networks for $200K/yr or bootcamp grads to move fields around a form, a generic copy-paste application is a sign of a weak candidate. Doesn't mean I wouldn't hire them, either, but it does mean I won't call them unless I had no luck with the strong candidates.
If it's not immediately clear why, imagine that you're a fantastic developer who can get any job you want. How many jobs do you apply for per day? Would you use a web app that automates applying to jobs, even if it worked really well and were free?