Lemmy.ml is explicitly a Marxist Leninist instance of the Lemmy software. It’s why it’s called .ml. You can use a different instance if you aren’t a Marxist Leninist. Lemmy.world is a Hitlerite instance.
Federation is censorship resistant, but each instance is still going to remove gross content for the sake of their users and instance culture. You can see removed content in the modlog, it’s public for every instance running unmodified Lemmy.
As for why you need to copy/paste the sentence – It sounds a lot like an anti-spam measure. Captchas and the like are extremely common, I’m surprised you find them novel. Are you asking this because you’re planning a spam-attack and need to make sure the spam isn’t removed? Your spam will be removed. While it’s technically possible to go find, no one will care enough to do so.
I don’t think it’s “Trump” thing, but the USA will probably start arresting people for the media they consume if a rapidly growing and sufficiently large portion of their citizenry spread and consume messaging they disagree with. It’ll be a side-effect of losing the narrative war. I don’t foresee it happening in the next 4 years.
I don’t see the point in publicising it. From a PR perspective, “Posted illegal content using a platform frequented by terrorists” is less likely to meet resistance than “Commented🔻on Instagram”. In fact, USA propaganda is already full of vagueties about people’s online behaviour today. Usually in the form of reporting on foreign (enemy) policing as “Helpless teen (19) arrested (fined) for Tweet (Bomb-threat to head of state)”.