Not dismissing your first argument but we had good success hiring talent through Discord servers. If you want to reach the same audience that attends hackathons and such it's in my experience the best platform.
Probably goes without saying here, but gaming tends to be an on-ramp for getting young people into computers/tech/programming. I started reversing, hacking, and writing bots for old MMOs to try to avoid the grind. I ended up enjoying writing naughty code more than playing the games themselves.
You don’t need a phone to use Discord AFAIK, but in my elderly imagination every teen is already on Discord.