I used to use the onion wiki to find markets and other things before this subreddit existed. But being on the clearnet, and on such a popular website, this shouldn't legal exist. Sure, you can say this is all hypothetical, but nobody is going to believe that in court. Not if you're caught and your Reddit account gets dug up. Reddit isn't like 4chan, it keeps every account that you create - even throw away accounts. Be as anonymous as you want, use TAILS, use whatever means you have; make the argument that all of this is hypothetical, but that won't hold up in court. The superlist and a simple search on one of the markets will out you.
i am afraid that a simple look at your google search history would be much worse than being a member of this sub.