Part of the reason for this is online job postings. The good candidates apply to some jobs, get hired, and stop applying. Some terrible candidates will apply t

Part of the reason for this is online job postings. The good candidates apply to some jobs, get hired, and stop applying. Some terrible candidates will apply to hundreds of jobs, never get hired for long, and just keep applying on every job posting. So a small minority of terrible coders end up being a disproportionately large fraction of interviewees.