OPs point is that kids are exposed to that right now, and no turning back the clock will change that. Creating a safe zone away from alcohol, guns, etc... and adding parental controls is a step in the right direction.
I'd prefer kids didn't use Instagram at all though.
You need to see a new big trend for fake profiles that are using big platforms such as sports and music to advertise their products. Has nothing to do with your search preferences
If they are making a separate kids platform why would your adult ads show.
You realize that by sharing those ad topics you are probably sharing too much of your interests. I get baby products.. it depends on what you've searched for lately.
Why do you hate progress? Look at how much progress humans have made in socialization all thanks to the great Zuckerberg! Humans are now closer then ever and living meaningful, happy lives!
I'd prefer kids didn't use Instagram at all though.