I'll admit most of those topics are those I don't browse reddit for, so it may be different for them, but in my experience most "true"/"real"/"uncensored" versions of subs are just full of bigots who got banned from the main one.
I can't speak for the others but in the case of Dota 2 the "true" subreddit just discusses the strategy of the game itself while the main one posts memes and fan art and talks about meta topics like eSports and the microtransactions.
