Not good IMO. The quality of that subreddit has been going down quickly, and I doubt this will help. Bigger communities always have lower quality content (I think its because it appeals to a wider group of people).

I guess it could bring some attention to bitcoin but if they take it like a get rich scheme like nearly everyone else has for the past month, this will only harm bitcoin's long term viability.


Edit: Just checked and bitcoin is no longer a default subreddit. I think it may have been because 5k+ people were on that subreddit all day.