My teens, and each one I have encountered through them, cannot discern a pixel from a wallsocket. They are tech consumers. Not tech savvy. My dad (82) is more tech savvy.
That will change. One thing that has not changed from our parents generation to our generation to the upcoming generations is that teenagers will be troublemakers, push boundaries, get caught doing a number of things that displease you, and get away with many more things that you won't find out about for decades - if ever.
And speaking more broadly, teenagers are in the process of growing into adults. With that comes the forging of their own identity, and part of that journey is trying things and discovering who they are - in no small part outside of your watchful gaze.
They don't know what they are doing, but they know how to follow instructions on github.