Linkedin has been known to shut down competing services prior to this. At hired.com, our API access was revoked (a long while ago), and many of our users were no longer able to login.
you guys rejected me as a customer even though my team is building data science stuff on open source technologies, because my employer does translation which is "a competing staffing service".
Likewise with us. Hypocritical to claim that Linkedin takes anti-competitive practices when Hired.com employs similar tactics. At least Linkedin still allows competitors to have Linkedin profiles.