Luck or chance depends on the type of gambling that you're engaged in, although no standpoint of viewing gambling can guarantee wins. If it's mostly casino games like slot then it is basically luck but if it is sports bet you can analyze the chances of winning your bet. Bettors who don't analyze games are depending on luck to win because they don't rely on statistics. Whatever strategy that you choose to measure, whether it's luck or chance remember that it is mostly luck that you need to win. Always use small amount to gamble, that is the only tool that you have a control over.
Luck, unfortunately, cannot be controlled and therefore all gamblers try to find some other levers with which they can achieve winning in gambling. And you are absolutely right that sports betting is a more controllable tool. Although in fact, we should not forget that in gambling there are card games, where the player can also make a very significant contribution to winning.
But in my opinion, those types of gambling where only luck controls the outcome of the game are needed simply for relaxation, and not for making money.