Twitter's lack of transparency is depressing. If they're going to lock the NY Post account, they should put a notification on the page (and perhaps a reason why). Right now if you go to the NY Post Twitter it just looks like they voluntarily decided to stop tweeting, which is misinformation.
As a counterpoint, Twitter as a company isn't forced to do any such thing, so if they think it can hurt its userbase and its revenue, it won't be done. Social media tries to establish a unique public forum, that gets policed by a single company. It's an unsustainable, doomed model. There's a reason the Internet as a whole is serviced by miriads of companies that are more or less forced to cooperate.
Obviously you have to be careful when coming up with rules for government regulation of media, but the laissez faire thing we're doing now doesn't seem to be heading on a positive trendline.