Some internet fora pretend to represent a community, and, sometimes, to some extent, they do. But it is common that the collection of users that would consider itself the community has no real power except to make a fuss (and maybe get banned) or walk away.
The Wikipedia community is a great example. There is a real community, but there is also a corporation which, for years, hid behind the trope that the community was in charge. Several years ago, they appear to have abandoned that, and the problems show up in quite a few ways.
Bottom line, the WikiMedia Foundation can and does, on its own, globally ban users, with no explanation and using a crude tool that disables account access and incoming email, cutting the user off. They announce to the world that the person is banned (without explanation but generally implying that the Terms of Service have been violated, which is sometimes false). In fact, the community is banned from communicating with the user! At least using the open email access that is normal through the MediaWiki interface. (Some time back it was discovered that a globally locked user could receive mail if they had email enabled, and so the Foundation quietly fixed that.)
And they do this arbitrarily, with no notice to the user, no warning, and they claim, no appeal possible. They ignore requests for review or to correct errors. It’s a lifetime ban of the person, not the account, and one person was banned with no account, banned by his real name.
Lenr-forum also bans users. For most bans, there is a fairly obvious reason, but occasionally, it’s personal and arbitrary and lenr-forum administration is opaque. But they cannot stop people from reading the site and commenting, and I’m not talking about creating sock puppets. Some time ago, I started occasionally commenting on lenr-forum, using hypothes.is. This tool was designed for academic use, largely. Comment on any web site, and share the comments with a group or with the world. I highly recommend it for the possibilities. I have the tool installed in my browser, so I can add a comment anywhere, with no fuss or special log-in, and I can make it private or publish it.
So, some links:
All comments on lenr-forum.com (by anyone using hypothes.is)
(at this point, both links return the same 116 comments. They are returned in reverse date order, so, as you can see, I made 7 comments recently.)
I just added new comments on a Shanahan post.