- People who will be hired immediately on applying because they're amazing. These people generally don't apply through the usual pipeline, they contact people they know and offer to work with them. Sometimes they get headhunted.
- Everyone else. To these people it is a numbers game where they have maybe a 5% [0] chance of being hired on applying and so need to apply to maybe 20+ jobs. Any challenge is going to be a massive pain for them because it represents a big time investment for little marginal gain.
[0] In the article there are 15 applicants, assuming you only hire 1 there is a 5% chance right there even if they are all obviously qualified and acceptable hires. And then there are a lot of "fake" jobs where the company is not actually going to end up hiring anyone this month.