How are you so sure the videos are at the top of Google results because they're artificially pushing YouTube and not just because that's where the relevant/popu

How are you so sure the videos are at the top of Google results because they're artificially pushing YouTube and not just because that's where the relevant/popular videos are? Actually I find Google video search is still the best place to find non-YouTube videos. Of course YouTube dominates if the content is there, but when it's not, Google is still great at returning relevant results on tons of other sites.