It was believed back when the WWE Network launched that WWE would be pulling all of their content from YouTube. That has not been the case and the content is being left on YouTube for a reason.
WWE Vice President of Digital & Print Rob Bernstein told the Digital Sports Fan Engagement Conference earlier this year that the company will not go after blocking YouTube videos of content they own because they believe it’s better to leave the videos there and get fans hooked on the product.
WWE believes that long term, it’s more beneficial and fans who get exposed to the product that way will spend more money. There are some videos WWE will go after, particularly if it’s something they don’t want up.
(Source: Wrestling Observer Newsletter)