There are many amazing talks about Blender being pubished due to Blender Conference.
However, you don't need to use Youtube to watch them! They're also being published on their PeerTube instance, @blender !
And yes, since PeerTube uses ActivityPub, you can browse, like and share, and even subscribe with your mastodon (or any other federated software) account!
Anyway, enjoy blender conference!