I think the suggestion to remove the kids' computer arises out of the expected likelihood that the kids will just load up Facebook, YouTube, Twitch etc. and install Steam, and never engage with anything other than those activities.

When I was a kid and I spent hours on the computer, none of that stuff existed, and it was difficult _not_ to learn interesting things because the primitive nature of the computers forced me to figure out a lot of non-obvious things. I wanted to play computer games too, but sometimes I had to figure out pretty advanced troubleshooting processes to even launch a game (for example).