The plot thickens...
It seems Google may have taken down Blender's videos on YouTube because they wouldn't display ads for them.
https://www.blender.org/media-exposure/youtube-blocks-blender-videos-worldwide/
@infinity Google has an uncanny knack of hurting the creators that made YouTube what it is today.
They can act the way they do now because they think they're the only game in town. Hopefully PeerTube will put pay to that!