A quick scan back on the several pages of discussion about the warning will show that sometimes it disappears for a day or so, or to certain browsers, or to certain other mysterious conditions. I'm still getting red screens today. No big surprise. 
To quickly repeat some of my earlier posts: there was a bout of malware on the server that hosts TAG, back in early 2015. We have been told this was fixed, and that TAG itself didn't have malware. No one is known to get malware from TAG - yet. 
Google provides searches by automatically scanning all of the web it can, and running the results through an indexing engine. It also notes when sites or servers host malware, and publishes a list of sites that it has found that have what it thinks is malware. 
It is easy to get off this list. You clean the site, then ask Google to rescan the site. They do, and if the site is clean, it's off the list within 24 hours. Happened to me on my personal site. I cleaned it up, asked for a rescan, and was removed from the list within a day of when I asked for the scan. 
Google is doing this as a public service to protect 
YOU by giving the white hats on the net some warning of where badness is found. Google is NOT being autocratic or overbearing. It's trying to help. This is NOT something that evil overlord Google is doing to control the universe. 
What's going on is that Allynmey is aware of the problem, and has been aware of it for over a year. He either does not care, doesn't want to fix it (or bother to fix it), or can't fix it for one reason or another. There have been mysterious comments about lost keys to the database from the first owner and that preventing an upgrade to the phpbb level, and that somehow tied into why a google rescan can't be done. There may be some logic there, but I can't see it. 
My personal conclusion is the airplane-on-autopilot scenario. Either nobody is in the cockpit, or the controls are locked out, or something similar. It's holding course until it runs out of fuel or otherwise crashes from external trouble. 
The problem with the warning being there and continuing to use the site is that people get trained to ignore malware warnings and if this site or some other site displays the warning, people get to automatically ignoring the warnings and run a high risk of getting infected. And possibly with something like ransom ware, which holds all the data on YOUR COMPUTER encrypted until you pay several hundred bucks. You get trained to ignore warnings. Bad juju indeed. It's not a benign situation.
Gainzilla wrote:Apologies for the silly question, but who owns TAG? Assuming someone had admin level access, couldn't the site be migrated to a new host on a fresh phpBB install? I might be willing/able to assist.
Many of us have volunteered time, money and other resources. No reply from Allynmey, even to the administrators that keep the cabin running and passengers in order while the plane flies on. Moderators/administrators that participate on the forum do not have the passwords to change the innermost parts of the server and copy it to new hosts, update, etc. That's apparently only Allynmey, and he has not responded to requests and offers of help. 
And the plane flies on.