One is censorship. other is free-will.

I'll pass along an anecdote from Gmail, which also uses explicit user feedback to label spam emails. Some people come to Gmail and say "Why did you block the [mass low-quality] email that I sent?" It's a pretty good answer if the reply is "Enough people marked your emails as spam that the emails were considered spam."

The hope is that users are savvy enough that we can get a good signal out of the block signal.