Instagram has sparked a backlash from users after it admitted it was reducing the picture quality on less-watched video posts, a move that critics argue could hamper users without large followings from increasing their reach. Instagram head Adam Mosseri confirmed the measure in a (seemingly hi-res) video clip responding to a user question, saying that “if something isn’t watched for a long time, because the vast majority of views are in the beginning, we will move to a lower quality video.” Mosseri later wrote that “we bias to higher quality (more CPU intensive encoding and more expensive stor…