You use this service so your resume stands out from the others. The more people use the service, the less likely your CV will stand out. Basically this is like

You use this service so your resume stands out from the others. The more people use the service, the less likely your CV will stand out. Basically this is like SEO, but for resumes. There is only so much attention there is to divide, and everybody is fighting for a slice of the pie.