I am sitting on the other side of the table. If I am actively looking for a gig, which rarely happens, I have a look into all the remote job boards. Then it depends on the job description and how the company presents itself. Otherwise the HN Freelancer/Job Threads each month are valuable too.

However, I must admit that 90% of my professional opportunities are generated through my own website. Recruiters for remote jobs or people with project based opportunities are reaching out to me after reading a blog post of mine. So I guess that many people/companies looking for remote professionals are evaluating websites from individuals (blogger/open source maintainer/...) too.