Of late I have observed that my https connections to perlmonks.org and www.perlmonks.org are providing me with the titled 'not secure' notice.
It appears to switch between both host names... https://perlmonks.org will be ok and https://www.perlmonks.org will not, and then other times the reverse is true. Knowing this, I can switch my URL domain name and not get the message, but this is incompatible with any bookmark I define. Sometimes it is secure, sometimes it is not. I change my bookmark and get similar results.
I'm not complaining, as I have a quick fix every time I see it. However, it could be confusing users relying on search engine links into the sites if they happen to use the more frequently mandated 'https' protocol.