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YouTube's ‘War’ on Adblockers Shows How Google Controls the Internet
(www.404media.co)
This is a most excellent place for technology news and articles.
So the answer is don't. Let your clients help you. Like peer tube. If a video gets incredibly popular, then it will have lots of watchers at the same time. If it has lots of watchers at the same time, that means anybody who starts to watch it after those watchers have started will be downloading the video from the watchers and not from the server.