Presumably the creators already have their videos, since they uploaded them to youtube in the first place. Hopefully they don't delete their own copies and rely on Google to safeguard them, though!
We desperately truly worldwide, encompassing, independent, standardized-so-that-anyone-can-communicatio-to-everyone p2p social networks. Social network providers should have only the role of any service provider, so you can change them on a daily basis with no repercusions, just as you can freely change your tailor, barber, news provider or internet provider.