I'd be much happier if this was regulated directly for the media.
On multiple occasions i've seen an article on reddit, read it, had a long argument about something, and they quote a part of the article I never saw, and when I click on the article, the title is different, the content is different, the "truth" is different. No "this article was edited", no "click here to see previous revisions", no nothing. And i'm talking about hours since the article was posted and the change.
Going years back is even worse, things i clearly remember happening, don't exist in the media anymore, here and there i found an old reddit comment with a link (+ wayback machine) to find what was written then, but without a link, that content "doesn't exist anymore".
Just mandate keeping all revisions of articles, even deleted ones directly, so anyone can see the previous version directly on the site, without needing a third party service and guessing the dates when the changes were made (but that 3rd party service can still work as a verification to check if they really kept everything).
Sites like wikipedia rely on media for many things, and consider what the media writes as "the truth" (not all media, just the one blessed by wikipedia admins), and changing media stories also means changing wikipedia, which already is the only source of info many people use even today.