Trolls would need to avoid being too overtly inflammatory, lest they get blocked by kneejerk reaction.

> What problem would it solve

Well, we could have a bunch of discussion boards again, ones that aren't at the permanent whims of profiteers or atrocious moderation. And strong anonymity even against global passive adversaries. Clearly there is a case for it, I know a lot of people who would find lots of joy in such a thing!