YouTube's business model is to monetize with their own advertising FWIW of course.
They're also geared towards "events" rather than 24/7.
Alas like most CDNs each has their own business model.
The advantage of YouTube is that it costs nothing.
All factors that need to be weighed.

I wouldn't call that "not ready" so much as YouTube is quite ready to implement their own business model which is not suited to those looking for monitization control.

I can't speak to the bit rate issue because because I'm not absolutely sure what you send is what the viewer receives. Since they are doing re-encodes I'm not sure that they're not doing a re-encode of the "master" data rate one is sending.