How is he bored on a PC? There are nigh infinite free games. Back when I was a kid, SSF2 was peak PC gaming. Or coolmathgames.

In all seriousness, I'm not sure what to say. You don't always need new games. Games like Minecraft provide limitless playtime that can be expanded by mods.

Also maybe introduce your kid to various other ways to pass time. Like you don't always have to be playing video games, you know?