The thing about kids isn't that they don't have any money. They do -- they can whine to their parents about it. Historically, kids were the most lucrative market to advertise to, because they are inexperienced with critical thinking skills, impulsive, and are excited little puppy dogs about everything.
In my day, that meant watching Saturday Morning Cartoons for GI Joe, or Transformers, or Teenage Mutant Ninja Turtles, or The Real Ghostbusters, seeing some new character or gadget, and begging for my Mom to get it for me next time we went out shopping.
Then the FCC created laws about this kind of stuff. Now kids shows needed to have a certain amount of educational content and not be so reliant on producing 30 minute toy commercials.
Kids drive a lot of markets, including a lot of markets nobody wants to say out loud. That's how we ended up with laws against Joe Camel.
And particularly when it comes to featuring or advertising to minors online, rules and regulations are getting tighter all the time (this is probably a good thing, which is a whole other post). A lot of places don't want to deal with this stuff, because kids are so financially lucrative. Just ask Youtube, who was legally required to deal with this issue and has let it spiral out into a whole "Youtube for Kids" problem that haunts many creators. Youtube's implementation of the law is so bad it's almost spiteful, and is rife with false positives (most likely on purpose).
But then that just creates a new version of this problem where a lot of creators, specifically on Youtube, are afraid of certain topics because it might get them branded as a kids account and thus they get clamped down to follow the law. Or it creates the inverse, where some creators are specifically forcing adult content into their videos in an attempt to ward off the kids algorithm. Which I'm sure is a whole tightrope act in itself, where you want to appear adult enough to scare away the kids algorithm, but not so adult that you also scare away the income that pays your bills.
