This gives my (personal) site a "B", but literally the only thing it "fails" is that it doesn't have a privacy policy listed at the (third party) site "ToS;DR".
My site is a personal site, doesn't have logins, and doesn't even have any Javascript, so I think the "B" is a little misleading.
(Side note: Amusingly, if you go to https://tosdr.org with the plugin installed, they also fail for apparently not having a privacy policy listed on their own site. Also it says in a very large font that their ratings are outdated, so I really don't know how useful this is.)
We don't feel we can give anything an "A" until TOSDR vets the privacy policy, and unfortunately they don't have a ton of sites vetted yet. However, we are committed to working with them to dramatically increase the number of sites rated.
My site is a personal site, doesn't have logins, and doesn't even have any Javascript, so I think the "B" is a little misleading.
(Side note: Amusingly, if you go to https://tosdr.org with the plugin installed, they also fail for apparently not having a privacy policy listed on their own site. Also it says in a very large font that their ratings are outdated, so I really don't know how useful this is.)