i'd imagine it's because its users aren't getting phished (small pool of people that's hard to target + no monetary gain + no connection to other accounts) and they just don't give enough of a fuck to change anything
while other sites want to either prevent fuckery or add some barriers to make them less responsible for others getting hacked

From what I've heard it's a site that's quite comfortable with the idea that it might disappear forever in the next 5 minutes and no one really cares. I'm not a manga guy so I never bothered signing up, but I think there's a lot of people in OP's situation as it's fallen into disuse. It's not going to have an active account help system because there's no one there to run it. My assumption is that it's just on autopilot with someone paying the bills and not paying attention, like many older sites.