This post is so Pinoy LOL. I don't see this game that often now or maybe I just don't spend as much time outside like before. This is gambling that even kids can manage. In fact I remember it's usually kids that go around asking people to make bets. The money they earn usually makes up for their capital (the card) and the hour spent convincing adults to play.
You are right that this can be made into an online "lottery" but that increases the odd that someone would win.
The main advantage of this gambling method over the other small ones like Bingo is you don't have to facilitate a draw yourself, the game does that for you and no one can accuse you of rigging. Also no need to gather the bettors or spend on announcements - they'd see the results on TV.
The concept is good however I don't think gamblers will care about basketball correct score which is almost impossible to predict and so the casinos have no incentive to add this game to their betting.
This is more like a lottery , some website may come up with a game like that only and ask you to predict all games and if you predict one correctly you get x prize, if two correctly x prize with the top prize being millions of dollars for the one who finds let say 7 correct scores.
Traditionally each card is for a single game and the "house" gets all the money if no one wins and a commission if someone does. It does resemble a lottery but instead of the numbers being drawn, it's based on the result of the game.