Why do you believe the cert is "bad"?
I also get a message about that.....if I use a third party browser (iCab). It states inconsistencies in it’s cert “network error” and “can not establish a secure connection”....so it will not even open. Maybe due to all of the tracking and advertising MacRumors has...especially on its homepage.
They too have to pay the bills...
No mention of the certificate being for MR.