We live in a market-driven society, people are free to choose to consume what they want to consume (as you point out) but that doesn't give carte blanche to the producers in the marketplace to do whatever they want in the name of ad revenue. When it does reach a tipping point, as I think we're seeing with this Medium article, regulation will start to come to a niche industry that had previously operated under the radar. Especially when human health consequences are involved, the government steps in to ensure protection to its citizens (and its most vulnerable members, children).
If you really are upset that you won't be able to view algorithmically generated children's cartoon videos stuffed with tropes and keywords that exist for no other purpose than to make money, I'm concerned for your wellbeing.