As I see it, a fatal problem with CEV is that even one persistent disagreement between humans leaves the AI unable to proceed, and I think such disagreements are overwhelmingly likely to occur. Adding other sentient beings to the mix only makes this problem even more intractable.
EDIT: I should clarify that I’m thinking of cases where no compromise is possible, e.g. a vegan vs. a sadist who derives their only joy from torturing sentient animals. You might say sadists don’t count, but there’s no clear place to draw the line of how selfish someone has to be to have their values disregarded.
EDIT 2: Nevermind, just read this comment instead.
You could handle both old and new scrapes by moving the content to a different URL, changing the original URL to a link to the new URL, and protecting only the new URL from scraping.