There are a lot of things parents can do on their own, but their mental capacity is limited
Don't want to be a parent in the 2000s? Don't be one.
It is 100% up to the parent(s) to supply and restrict access to the internet and internet connected devices. If that is beyond your capabilities as a parent-aged human in 2026 then you fucking dropped the ball. We are the "digital natives", we all grew up with an internet connection, some parents have never known a time without smart phones. A failure to learn about and understand how to use modern technology today is incredible.