HTML 5 games inside of Discord

Telegram has games.
Facebook has games.
HTML 5 games are easy to make. Discord is web tech.

Why is there no effort to make the API give us tools to make games inside Discord? 
Right target audience. Boosts engagement. Tech is easy, get lots of games.

I want to make a game to play with friends on Discord, seamlessly, right there.
All it needs is some 60 fps canvas or whatever embedded iframe sdk magic these other platforms use.

What's the matter Discord? The Chat platform for gamers, that is already working on web tech cannot do this, while others can?