Does not hide scores on MAL in the statistics section of individual anime pages, or when using the search.

Decent. Used this for Goodreads. Would be nice if there's a feature to hide community reviews on a book page

Not anywhere near thorough enough. On Google search results it only blurs the ratings, such that you can still easily see what the rating is. On book pages on Goodreads the rating isn't hidden at all. It doesn't hide IMDb ratings on movie pages either. Edit: Interesting result — if I am simultaneously running "Goodreads Review Shield for Authors", the ratings on book pages are successfully hidden. (However it often takes several seconds.)

Good, but not efficient. You can still see some ratings on Google, IMDB, and MAL