Wikipedia Zero users are thinking that http://test.wikipedia.org/ and commons is some sort of YouTube. They uploaded thousands of out-of-scope/copyright violation files to wiki.
Now blocked by abuse filter: https://test.wikipedia.org/wiki/Special:AbuseFilter/160 on testwiki.
A example on commons can be found here
I also had a talk with Alex Z on irc, citing part of here:
14:39:32 <AlexZ> Steinsplitter: I've been getting individual emails from the hundreds of users I've blocked there. They all seem to be under the impression that's that's what test wiki is for... to be a "free YouTube" for Wikipedia Zero. (...) 4:47:33 <AlexZ> I even saw someone try to upload a how-to video on uploading movies to test... 14:50:38 <AlexZ> https://test.wikipedia.org/wiki/Special:AbuseLog/32063
See this as well: