It depends a lot on the genre. Some pay $3-5 CPM I believe (so, $3k-5k per million). And that's just the youtube ads; once a channel gets a lot of subscribers they can attract external sponsors as well.
There used to be a sponsoring segment in the beginning, but, if I recall correctly, they ended the contract after the stunt became known and it was cut.
Affiliate link, not a sponsor. It's a common ruse by YouTubers to refer to them as sponsors to suggest that there's a negotiated commercial relationship when there isn't.
