Welcome back mactep, haven't seen you in a while.
Just a thought on this, were the tinyurls directing to an affiliate network or to a private domain? The thought here is, maybe they are tracking activity by spidering the links.
Additionally if there was a common watermark in all these videos (ie: yoursite.com), it wouldn't surprise me if they were now detecting things like that, just as they can scan and process the audio tracks.
Ash