I will posit that the main problem with the idea is that when I'm browsing some page I probably don't want to see comments from all the people that have been ba

I will posit that the main problem with the idea is that when I'm browsing some page I probably don't want to see comments from all the people that have been banned from that page, or who couldn't be bothered to make an account. If I like a page I probably agree with their moderation decisions more than not, and being able to browse a big pile of rejected comments doesn't interest me at all. And even if there are people there commenting just because it's easier than making an account, that's going to facilitate very low-effort drive-by comments from people who are coming from somewhere else on the web. And if people want to talk about some page that doesn't have comments, that's what Twitter and Reddit, historically, are for. The hard parts are not technical, they're social.