Same. The dutch subreddit mods will ban anyone that doesn't align with them on tiny things. So if you want to keep contributing to that community you must swim with the majority or they will ban you.
HN has some very clear biases that you simply must subscribe to if you don't want your comment to be downvoted. It's clear that people here have certain stocks and don't like certain companies to be put in a negative light, for example. I don't think my account suffers the problems from this too often, but I've seen plenty of comments here at the bottom of the comment section simply because they disagreed with the status quo or because they asked an uncomfortable question.
Every now and then, I also see shadowbanned people here, who continue to make nearly invisible posts for a while and then just leave, seemingly caught by some kind of automatic filter or punished severely for a dumb comment weeks ago.
Besides I think you cannot compare shadow banning, banning and down voting at all. Shadow banning should only be reserved for spam. Banning for obvious trolls. If you get down voted that's fine. It only shows your views don't align well with the group majority.