The issue with Reddit (and social media platforms in general) is you are basically bound by their own rules, systems, etc and reliant on them not doing stupid crap to screw you over. Could be as simple as just a shitty new interface or a big site wide rule change that screws over entire subreddits, and just overall you're stuck dealing with their policies and not really independent. I saw a lot of that when I was a mod for one of the Canada subs. I decided to pull out. I was pretty lenient as I don't really believe in removing opinion based content, only spam, or people being pure assholes, but Reddit leans very left so they really frown upon certain content and as a mod you're expected to delete it or the sub can potentially get shut down or taken over.
That and the Reddit format is really not well suited for having proper discussions especially longer term, it's more about posting one thing, then everyone can comment on it, then by next day that thread is buried. Threads that are more than a few days old are pretty much forgotten about, unless someone relies to one of your posts you'll get notified so that sub conversation can kind of continue but nobody else will really see it unless they specifically go to that thread.
With that said, maybe everyone should in fact at least bookmark or remember the
https://www.reddit.com/r/atot sub. If the site does die at some point in years from now, at least it's a place to go to decide about what forum is the next one to move to.
Come to think of it, maybe Gamers Nexus or Linus Tech Tips can buy Anandtech from Future. That seems like it would be the best bet really. They could at least keep it running as is, or merge it.