Uploading/Streaming WOW private servers on Youtube

So in the past I've googled if it was possible to stream or upload content from WOW private servers on youtube and people keep saying you shouldn't coz private servers are illegal and you'll get banned.

But for the past couple of months Youtube has been showing me WOW private servers on their ads. Particularly the ascension one.

Since YT seems to be alright with advertising WOW Private servers, does that mean it's safe to upload/stream content from WOW private servers?