It would be more in line with your local library refusing to catalog your book. Youtube is a content host, not a publisher.
So my point still stands that the norm is for media companies to be able to curate their content as they see fit.
Even the terminology is consistent with publisher - channel, subscriber, and so on.
If the content is explicitly uploaded to YT, then how is it not a publisher?
The monetization aspect seems to be the only differentiation between what would consist a virtual library and a publisher.
And we know how difficult it is to get monetized on YouTube and make it a viable source of income.