In my experience YouTube does not allow:
-Affiliate linking to adult.
-Linking directly to adult.
-URL watermarks linking directly to adult.
You can talk about your brand and have brand watermarks as long as they don't include a URL. If people are interested, they will look you up and they will find your site / content.
Here is an example of one of our videos on
YouTube
We may not have millions of views but it does send traffic and we have / had multiple accounts that rarely get flagged and taken down and we've even had some reinstated.