r/bitcoin is full of bitcoin fanatics who will bury any cryptocurrency-related news that isn't bitcoin. Mention XRP, BTS, ETH, or really any next-gen blockchain tech that doesn't ride on bitcoin and you are called a heretic.
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.