Youtube adverts are not being blocked from 9th Dec 2024

@Big_Monkey,
First, please update to the latest build of the browser (v1.73.101 at the time of writing this). Then, go to brave://components and ensure that the Brave Ad Block Updater component is fully up to date (you can click Check for update to make sure).

Then try streaming youtube content again and let me know if the issue persists.