<...>. I hope he doesn't get too attached to that and make sure to focus on his priorities first.
Expect your friend to come back in a few months and say "
yo, it's your fault that i'm now addicted to online gambling" LOL

This is what I'm scared about. I'm trying to
evade the responsibility of my friend's actions. It's his decision, not mine! Lol.
Right, you can't be blamed if a certain person got addicted to playing. Giving precautions to your friend when inviting can help him think about what he might be after playing gambling online.
Every one of us has our own decision and giving precautions can make your friend more cautious about what he is doing. Inviting is not bad though as long as you know that the certain person can control himself on a bad situation.