YouTube’s Takedown Numbers are a Mystery, But Content-ID is a ‘Cash Cow’ 

Google transparently reports the billions of copyright takedown requests it receives for its search engine. However, finding out how many videos are flagged and removed on YouTube appears to be quite the challenge. We gave it a go nonetheless and can also conclude that the Content ID system is a cash cow.

Source: YouTube’s Takedown Numbers are a Mystery, But Content-ID is a ‘Cash Cow’ * TorrentFreak