I don't know why you're being downvoted, because you are obviously right — just like the audience will go where the content is, the content creators will go where they can get an audience.

Probably downvoted because of that last sentence.

But that's actually a good insight: it isn't Google that has taught me anything, but people, who happened to use Google's properties to distribute knowledge. Any other service would be as good, if the people chose to use it.