It need not be shared , think more like a public notion/ share point document with comments visible . I.e experts(users) can create their own individual annotated versions and share with others .
As long as there is no single version of the annotations , moderation is not needed
I think the issue is that a person reading without an interlocutor has a better chance of getting some truth from the sum of the bill than reading with an “expert” bent on swaying them towards a fringe interpretation or even directly lying to distort the content. The feature lets them put on an air of factuality but really just inveigle people with a chopped take on a document.