In all fairness, here are 2 points from their submission guidelines...

  * News articles that do not contain the word "Bitcoin" are
    usually off-topic. This subreddit is not about general
    financial news.
  * Submissions that are mostly about some other
    cryptocurrency belong elsewhere. For example,
    /r/CryptoCurrency is a good place to discuss all
    cryptocurrencies.

So it seems that if you submit something that isn't bitcoin-related, you should /expect/ that it will get downvoted, or moderated.