Not really. They've de-emphasized topics that promote harassment and violence. "Atheists" or "Mormon" topics rarely, if ever, stoop that low, so I don't think you're comparing the same things here.
This is a very common refrain and I would agree completely with this if we didn't live in a society where Facebook, Twitter and YouTube dominated the our communication channels. I wish that we had a neutral way (like email) to reach a large audience and that it wasn't owned by three or four private companies.
Are you saying the feature is that you can block phone numbers? Or is there some central list?
It can't be a central list due to all the spoofing going on. Almost all spam calls are spoofed these days from what I've seen.