Section 230 has nothing to do with whether a platform is impartial or not. All it does is make it so they are not treated as the publisher or speaker of third p

Section 230 has nothing to do with whether a platform is impartial or not. All it does is make it so they are not treated as the publisher or speaker of third party content. So if I post something on Facebook full of libelous statements about you section 230 means you sue me, not Facebook, over that libel because that libel is my speech, not Facebooks. If Facebook figures out that libels posts about you are engaging and starts pushing them in everyone's feeds section 230 would protect Facebook if you wanted to sue them for libel. I don't think section 230 would care though if you wanted to sue Facebook over their engagement seeking algorithm.