My bet: 1. Advertisers don't want to be featured on an ISIS recruitment video, or something like that. 2. Google implements a filter. It is fuzzy and based on machine learning, because Google are strong believers of machine learning. 3. The algorithm let a single ISIS recruitment video through. Advertisers form a coalition and yell "NO ISIS RECRUITMENT VIDEOS!" 4. This forces Google to implement either whitelists, or…
It seems like YouTube must be backed into a corner where that's the only feasible way to do it, at least as a first pass. Video is uploaded at what, 5000x realtime? Or 100 years of video per week?