As a former teen who had parents try this, we were wily enough to find the relevant computer power cables quickly. And it's harder today.

You won't win this way. The kid will obtain a second device and you'll have both a screaming match and an uphill battle. Or they will mooch elsewhere and forget about seeing your kid.

My parents didn't let me have video games as a kid. Sure I could still play at a friends' house, but it was very different from having my own console or handheld.