Those things already exist, they just can be broken if your kid is smart enough. For me if they spend the time learning enough coding/base computer knowledge to break out of the box then I will applaud them and keep visually monitoring them and having regular conversations about online safety and privacy like I always have intended.
My parents did this, but it was way back right after we got out of dial up and I was already a teenager or very close to it and trying my hand at programming my own games. My mom got the software out of some bargain bin and the point was to limit screen time and stop certain programs from launching. I realized if I completely broke it my mom would probably realize, as it had a reporting function. So I went in and changed the unit from “minute” to hour. So if I was on the computer for 3 hours and my mom looked at it would say 3 minutes, she didn’t check those logs much anyway, but the few times she did I was just like “needed to search something on Ask Jeeves for homework real quick”. It actually took my mom more time to install the software then it took me to make that change… probably because that was a time when people actually still read through the Terms & Conditions…