Not something that should be prevented.

> false information, information manipulation

Not something any one person should be the arbiter of.

> and any other number of malicious inputs that otherwise in a forum for people require trust to maintain community quality

Trust is how you solve this. Forums shouldn't be letting randoms sign up and post. Just like we developers don't let randoms commit to our git repositories.

But they want that mass market appeal, don't they? They want everyone to have input access, to be able to comment and participate. Usually because they're pushing ads and the more eyeballs the better. They're hopelessly dependent on "engagement".

> That world is the literal death of the "open" internet.

Not really. It might mean the death of the "free" internet but not the "open" one. The open internet is the one where we get to use whatever software we want to interoperate without restriction. It's the one where we get to use a Python script to scrape your site if we wish to do so. It's the one where we get to download videos with yt-dlp.