WSB banned the discussion years ago because WSBs isn't a subreddit for crypto trading, but stock market trading. Another problem with crypto discussion on Reddit (at least historically) is that a lot of it has just been people trying to pump the price of some alt-coin and for this reason you'll find discussion about penny stocks also banned on a lot of investing / stock market subreddits too.

I'm sure they would allow posts about Riot Blockchain or MicroStrategy stock, but buying bitcoin on leverage isn't really a "Wall Street" bet.