How does this game even reward players?

If you are desparate for a reward, you could always ask a familiy member/friend/significant other to come pat you on the back every time you win a game?

Reward? For what?

IP?

It doesn't.

You should probably stop playing.

It's like asking "how does using a computer reward you?". Does your computer give you free gift cards to your favorite shop?

You play because you enjoy the game. Simple as that. If you don't enjoy playing, move on somewhere else.

Playing games isn't a job, you're not supposed to be paid for playing games, you're supposed to enjoy playing games (unless you actually do it as a job, but most people don't. And in that instance the rewards are irl money).

It's fun. That should be its own reward.