I’ve noticed that some channels are on BrightTALK and others are on third-party websites. How does that work?

While all channels are hosted on BrightTALK, they are also designed so channel owners can easily embed them into their own websites. Some channel owners prefer to keep their webinars restricted to the attendees they have invited themselves. In this case, you may see the channel embedded on their websites but not searchable on BrightTALK.