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YouTube warns it might make your viewing experience worse if you don't turn off your ad-blocker
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
It's a constant game of cat and mouse, an arms race till the end of time. You can't block videos from ad-block users if you can't tell which users are using adblock and which are not.
It's quite complicated technologically, and requires quite a lot of storage space. Viewers only go where the creators go, and the creators have no reason to go to someplace that is more of a pain in the ass to host videos.