That's what the "Talk" section functionally does. People can (and do) check it when an article has lots of frequent heavy editing. And a lot of these edits do get rolled back as they're exposed, as Wikipedia admins are reasonably good at keeping the propaganda generically pro-western rather than nakedly for-profit or regionally partisan.

At the same time, Wales is a self-proclaimed libertarian who is constantly putting his hand out to keep the website funded and operational. I have to assume there's a certain degree of self-dealing happening in the background just to keep the site from getting the kind of abuse suffered by Internet Archive or Anna's Archive.