agree. depends on what you are trying to control. Our exp

exprience was about the time ( wanted them to go to bed earlier and limited the playing game time ) ,  tried many softwares, just like yours,  cracked one after another...   LD is in CS..   hahaha

In the end, I used the old fashion way,   bought a safe  ( it has a hole that you can have power supply)  , and put router inside,  then connect with the timer which turned off the power supply at certein time.  It worked for quite while, utill one day, my youner one managed using a chopstick to pull the timer near the hole and disabled the timer..    at least it worked for sometime, by the time they were in last two yeas of high school,  we gave up...     Lol

Definitely was not easy, but it is part of being parents..