I personally find a "right ro be forgotten" as such laughable, but I understand it was specifically introduced not to expose something stupid you did or said, or a non-advantageous photo taken from you or similar as your only public record in times of clickbait and staged polarizing crap. Then there's the problem of copyrighted material, and of publishing stuff on your site with the intent of making money off your user's attention via ads, one of the very few avenues of financing content creation. All these concerns have to be balanced against another, which creates a difficult legal environment for archival sites.