I’m going to quote our Tech Administrator @DemonGoddess on the subject of the site’s SSL, back in April 2018:
“We actually have a certificate, which I can get to work for about ten minutes, and then it doesn’t again. I have Nexcess looking at that for me, again. We don’t actually process any financial stuff through the site, so unless you’re putting your private information out there for all to see, you’re safe. Personal information asked for at registration, for example, is HIDDEN and only seen by mods and admins, and not searchable. We set it up that way, so that it isn’t. What gets around that, just like anywhere else, is where people will put personal information in the public profiles.”
I’ve been a staff member for over ten years, and I’m very security conscious when it comes to being online. I can tell you that I have been getting the same “Not secure” label from Chrome, and while many other sites have sent Malwarebytes Premium into absolute tizzies, I have never once gotten a malware warning for AFF.