[haasted]

Couldn't it be a simple test of whether the applicant had read the posting thoroughly? It's a quick filter to remove anyone who didn't manage to fulfill this no-effort criteria in their application.

A lot of applicants simply send their resumes to any position that is vaguely relevant, without diving into the details of the role.

A little bit like Van Halen's "Brown M&M clause": https://effectiviology.com/brown-mms/

[version_five]

Yes, they definitely helps. I posted some jobs on linkedin and got absolutely garbage applicants. So the next time I wrote "do not apply on LinkedIn, email cv to xxxx". It was unbelievable to see how I had exactly the same wave of useless applications come in via LinkedIn's automated process, which I got to summarily ignore, and got a way higher average quality sent by email.