(maybe not even knowing exactly where they are)

I think this is happening increasingly. Some new users don't seem to understand federation. They think it's just an advert-free Reddit and wander anywhere they like thinking it's the same all over. They should be wandering, like, but they'll have to get used to the fact that instances as well as communities have rules.

For example, someone made a comment on an article posted in !learnspanish@lemmygrad.ml. Now, I'm no expert, hence being on a language learning community, but it seems like liberal anti-communism to me. I think liberals see the content of our communities and come in thinking they can bring their liberalism to bear on the subject, without realising that all content here comes under the auspices of Marxism.