It shouldn't be that difficult for video downloaders to learn how to strip out in-video ads. They're going to be a sharp cut both in video and audio, for a specific, fairly-well-known length of time, then a cut back.
And even if platform starts to make blurry transitions for ads, adjust volume/brightness, or even overlay ad text over existing video like a watermark, client can just download the same video multiple times and remove unique frames/pixels.
