Serious question: What kind of speech is being censored here? There is no conceivable message behind these videos, it's a cash grab, that is the point of the article.

The videos in question would still exist on YouTube, even if they would be banned from YouTube Kids. I don't see how that could possibly infringe on anyone's free speech. Free speech doesn't mean that you have the right to broadcast all of your creations to children without anyone stepping in.

The article is criticising content curation via algorithm. What does it have to do with free speech?

Definitely get vibes of the fringe leftist ideals of anti-capitalism and anti-freedom of speech.