No internet before they can actually explain how it works. My main goal would be to prevent them from thinking of it as some kind of magic machine that delivers them dopamine. Teach em TCP/IP, Networking, how HTTP functions, how things are actually rendered and what ot actually takes for information to go from bits to images. Then talk to them about how those mechanisms are exploited and how to exploit them back. Advertisement, dark patterns, attention-algorithms and all that. Scoff at them for not using an ad blocker and maybe teach them some small tricks that would make them cool among their peers. I mean, imagine if a Kindergartener showed up to class with their school mandated iPad but was fully able to operate Wireshark lmao

All that is a hypothetical of course, no way in hell I'm having kids.