YouTube wants to have half of the featured videos in its trending tab come from streams originating on the company’s own site going forward, according to the latest quarterly letter from chief executive Susan Wojcicki. The letter, directed to YouTube’s users, is meant to help ease concerns the site’s biggest stars have over copyright challenges, advertising policies and video monetization — along with their shrinking presence on the site’s trending feature. YouTube’s biggest contributors are worried that their footprint on the trending tab is shrinking as the company favors “safer” content coming from other, more traditional, media like repurposed television clips, movie trailers, and music videos. It’s been a rough quarter for YouTube.