I have some bad news for you about news.ycombinator.com or any other web forum. Unless you actually own the web site you can be prevented from posting on a whim.

Of course, most reputable forums have policies and rules but at the end of the day these do not mean much. Who are you going to complain to if you get unjustly banned - the Internet police?

You can always start your own blog/forum/subreddit and post whatever you like.