Literally everybody can see exactly what was written, when, and from which IP address. Not only is that history maintained indefinitely on Wikipedia, it’s also downloaded by thousands of people around the world.

Everybody who has ever added a missing punctuation mark to a page is recorded in history, the specific date and time and page and action, accessible even if the world wide web goes down and Wikipedia ceases to exist.

I’m not sure if your ‘anonymous graffiti’ analogy is quite right, though I’m also struggling to imagine many places in my country where someone could graffiti on a wall and not be tracked down very quickly if necessary.