From what I gathered (and I haven't banned anyone from this sub), a few users have been suspended or shadowbanned. They are still trying to post but obviously their post isn't being seen.
If you believe you have been shadowbanned (by the site) unfairly, here are some tips to try and resolve the issue.
So how do you get un-shadowbanned? Check http://nullprogram.com/am-i-shadowbanned/ to make sure that you are actually shadowbanned. I don't want anyone going through the trouble of all this, only to find out they were never shadowbanned.
Once you have done that, send messages to the admins until you get a reply. No more than one a day, but often enough so that eventually they will respond. I recommend two or three a week at maximum. Don't expect a quick reply, the Admins are very busy and often single messages fall through the cracks.
This message should include a few very important things. First; your shadowbanned username. Second; a request for an explanation. Third; try to make it respectful. Its a really unfair process, and being respectful makes it more likely they will respond to you. It should pretty much read as:
"Hello! I believe my account [Shadowbanned username here] may have been shadowbanned in error, is it possible that one of the Admins could take a look at my ban and tell me why I was shadowbanned, and perhaps give me a chance to show you why I believe it was in error? Thank you so much! [Username Here]
Keep it up with slight variations of this until you receive a reply. Once they have told you why, think long and hard. Are they right? If so, stop now, and go forward with your alternate account. This isn't a guide to circumventing the rules, its an appeals process. If they were in error, prove it. Find the post/messages/comments in question, and use them to, politely, prove your innocence. Take a screenshot and underline key words and phrases. Upload it to imgur and send it as a simple image, the kind that is very difficult to fake. Once you have done that, just keep messaging them. The only advice I can give you from hereon in is persistence. Don't give up.
TL;DR 1) Message Admins asking why you were shadowbanned (politely) 2) Use post/messages/comments in question to prove innocence 3) Keep messaging the Admins, no more than once a day.
Good luck!