Why don't you try asking them?

Nonetheless, I am sure that you could live without any of the content hosted on those YouTube channels. The word "content" is a fair terminology in this context since if any media is so pigeonholed as to demand being streamed and served from YouTube, it must not be that artistic, thoughtful, or useful to most viewers. YouTube doesn't optimize for utility, art, usefulness, tact, expression, or value. It optimizes for addiction.