My thought on why you see more communists, anarchists, and leftists in general in open source and federated platforms is that efforts centered around collaboration are likely to draw people who are more collaborative-minded.
Eventually logic and educated thought will drive them to somewhere else. Their ideas look great on paper but never live up to the hype. Human society doesn't cooperate well in groups larger than one hundred. You need strict rules and major punishments for large groups and that leads to an imbalance of power and authoritarian rule.
Because the internet is a place where people from the real world come to share their thoughts? I hate to break it to you, but their presence here means they exist in the real world too. So your question could just as well be "why are there so many commies in the world"?
Why so snarky? I just noticed that fed is way more communist than any other space I have ever been in and I am a lecturer at a very left leaning University, living in a very left leaning community.
I only replied with a snarky tone because you started the thread with snark in the title.
Guess it must be that they feel comfortable sharing their views here unlike in real life. I'm all for it, if that's the case. People should be able to express themselves.
Specific to Lemmy, perhaps because it was/is developed by communists in reaction to a perceived pro-western, America-centric bias on the rest of the web? See the History of Lemmy.
How do you know they're Communists/Marxists? I mean yeah, I noticed something might be the case, but I wouldn't assume it's because they're Communists/Marxists. Not that I would mind (even though I'm not a Communist/Marxist), just being a Communist/Marxist alone is not a big deal (as opposed to being someone who fits the stereotypes of one).
I will say though I do have a friend who identifies that way who I recommended to this place. She has been struggling and I thought it would be a good gesture.