APEX LEGENDS shoud penalize players who leave their match early.

Assuming you're talking about pubs since ranked has a penalty... the answer is still no, thank you. No penalties in the casual mode of a free to play game are needed. If you need reliable teammates then you should be in ranked or playing with people you know and can rely on. Or both. If you're going to solo queue with randoms then you can't reasonably expect the best experience the game has to offer.