I think it's ok to make on both like you are doing now. But sometimes exclusive for dtube is great as well. Because in dtube as you see, the activity on created video is only in the first days after uploading. But in youtube is there always. Even if the video in youtube is one year old, it could became famous any day because of the algorithms they have. Sometimes putting exclusive videos for dtube in youtube is good as well because we need more quality creators here.