They've got so many moderation related issues.
Amidst all this accounts that randomly spam the site with collections of articles and etc run free. They don't participate in discussion (maybe a handful of actual comments... with more links), they just push a particular point of view and inundate every sub they can find with article after article....
A simple query "hey is this user just spamming submissions" could deal with some of them.
If you search new you're presented with repost after repost of these spammers, sometimes reposing their own content, just from another news source.
If you're part of a location based sub that is in the news, it's just an AVALANCHE of distantly cause related submitters spamming it up.