Broad platforms serving every industry from graphic design to app development often lack:
SEO-specific vetting or certification processes
Categorization by SEO specialty (technical, local, e-commerce, link building)
Verified ranking or traffic results tied to freelancer profiles
Reviewers who actually understand SEO metrics enough to leave meaningful feedback
This is exactly why dedicated freelance SEO (http://www.freelancerforseo.com) platforms have grown in popularity — they solve a very specific hiring problem that generic sites weren't built for.