To post on nostr you’d need to reupload to a non-YouTube server somewhere (probably AWS). Then you create the video event. 

It is extra work for sure. Right now, there’s not much benefit for a large YouTuber to do this. In fact it’s probably a waste of time unless they don’t mind paying someone else to do it for them. 

You’d need to find smaller YouTubers who have already tasted a bit of that rugging threat who may actually understand why they need nostr. To them, it might be worth the time to get involved with nostr slowly with some content. 

My guess is this would be your privacy / tech crowd or anyone who has already been rugged before or is still rugged. 

Not saying it’ll be easy, but there is an angle here to try. 

 Doesn't sound easy at all. Amazon web server sounds, being amazon, also like a risk to store content for long term. But I don't really know the details how it all works. 
What I think get, is that ideally (in some hopefully near future) we have small/big servers scattered around the globe storing nostr content, were people see the benefit of nostr and invest in these servers for there own good. For now we get people aware this new way of posting content exists.