Warning to all Brave Browser Users
Blocking variations.brave.com which is used for A/B testing could potentially break Brave's functionalities. For me did Brave's "forgetful browsing" feature broke which seems to be disabled by default if you block this domain.
YouTube ads are served on the same server as the video… So they would have to filter it through one of their servers and block the elements and stream it to you.
So if you're using them for privacy… you better trust them a lot because they would have equivalent info as google.