Now imagine that they would not be engaging with silly YouTube videos, but with an AI trying to get them to interact with them in order to learn to speak, to learn about the world. Things which parents can't dedicate enough time to. Then also give the kids ideas for what to do with the parents, what to talk about, tease them about science and stuff they'd normally have no access to, because it is information mostly hidden in books or in an inaccessible format, like dedicated to students.
I do see a huge potential in this, call it cheaply a "nanny for the brain", to help develop it better and faster. There are certainly risks to it, but if it were well done, in a way in which we assume universities are "places well done", it could be better than just having the kids watching TV.