The voice of Jesus explained to David—mainly because it instructed the apostles 2,000 a long time ahead of, “Freely you may have been given; freely give.” So David hasn't billed for his time, instructing or any of the numerous resources he provides away, but has actually been supported fully by https://www.youtube.com/playlist?list=PLXR6KmNsDBjSQgdIOJ1JFzHP8923tHwyl