Elsa pregnant Spider man?

I know the content is generated in conformance to The Algorithm, but how do the individual content producers discover what it wants? Is there a list of key words? Do they all just copy each other's most popular videos?

Also, I wonder what effect this will have on the kids I see being pacified by this stuff running on a loop on an ipad in restaurants. I know every generation of olds wonders this, so I'm not sure how much is that or how much is a real concern.