/r/pics is one of the strongest protest subs on my feed right now, I think it’s the right idea. /r/interestingasfuck is even better.

Is there a place to see what’s blocked, and why?

I’ll echo this sentiment. I also lurk communities that I don’t agree with, and I want to see dissenting views. I find that heavy moderation often just leads to echo chambers where real issues can be kicked under the rug