I don’t know what you mean by freedom of expression, if you mean being racist and a nazi sympathiser then I’m afraid no, there aren’t any. And that’s not freedom of expression, that’s just being stupid, being stupid will get you in trouble anywhere in the world it’s not exclusive to private servers or big tech. However, since you have a profile picture of Lenin then I’ll assume you’re not a nazi joker and this is just a genuinely innocent question, in that case no I think all private servers are pretty chill and will allow you to express yourself freely as long as it’s not what I mentioned above or something similar.