When I left home at 19, things opened up for me a lot more than I expected. But I still regret the 8 years that I was just “hanging in there” because the alternative was just so much better. I see where you are coming from, but unless the parents are only somewhat bad parents that otherwise take care of you, this is bad advice.
It still does it. The only thing is that the awareness of this feature was spread in a way to make it sound like it was just stealing your internet for nothing (which looking at it one way, it was) so most people just turned it off.