I would agree with you for a vulnerability like Heartbleed, where the attack was against the site itself. This is an attack against the users of these sites, s

I would agree with you for a vulnerability like Heartbleed, where the attack was against the site itself. This is an attack against the users of these sites, so users need to know which sites are vulnerable. Also, attackers are far more capable of gathering this data on their own than users are.