In regards to the editing part, sure, I'm sure they can track your edit history. However, on a large scale, most edits are going to be to correct things. To determine if an edit was to poison the text, it would likely require manual review and flagging. There's no way they're going to sift through all of the edits on individual accounts to determine this, so it's still worthwhile to do.
Although they could sidestep the issue a bit by simply comparing the changes between edits. Huge changes could just be discarded, while minor ones are fine.
You could easily make a minor change that negates every single other fact.
In regards to the editing part, sure, I'm sure they can track your edit history. However, on a large scale, most edits are going to be to correct things. To determine if an edit was to poison the text, it would likely require manual review and flagging. There's no way they're going to sift through all of the edits on individual accounts to determine this, so it's still worthwhile to do.
Although they could sidestep the issue a bit by simply comparing the changes between edits. Huge changes could just be discarded, while minor ones are fine.
You could easily make a minor change that negates every single other fact.