Notice the common thread: the bakers in question are only able to even float the case by claiming their cakes are artistic expression, and therefore protected. Good luck passing the most basic argument that providing electricity is artistic expression. And this entire diversion is irrelevant to the meta-question; the President is trying to censor speech he doesn't like, he's not trying to force speech out of someone who would prefer to be silent. Your examples of LGBT and black voices being censored in the past are irrelevant; if the President were, hypothetically, saying "Black people" or "LGBTQ people are human beings, deserving of all rights" and Twitter were fact-checking with boxes saying "[citations from phrenology] indicate black people have inferior brain construction," that would be distasteful and disgusting in the extreme, and worthy of leaving Twitter over as an individual user... But not something the President should shut them down for. The First Amendment exists (among other reasons) so the President's viewpoint isn't the only legally allowed viewpoint, for good and ill.

You dodged the meta-question by trying to appeal to the specific attack on Section 230 that has been proposed (scoped to particular sizes) so you didn't have to answer whether the HN shutdown hypothetical would be acceptable. It would not be. Neither would shutting down Twitter. Size is irrelevant.