RTL, one of the largest TV groups in Europe and 75% owned by the influential Bertelsmann Group, has bought into the new YouTube channels, by taking a $36 million investment, which represents a 51% shareholding in one of YouTube’s biggest channel suppliers BroadbandTV BroadbandTV is a Canadian multi-channel network which so far is the fifth largest on YouTube, managing more than 7,800 channels and generating around 800 million video views per month. With RTL’s help it could soon be doing very much more than that. Bertelsmann has long been a conservative business and when it moves in media, it is usually decisive and for the long term. It has the assets both in terms of content reach as well as…