Indeed, it has similarities but the way to gain is totally different. Gambling usually doesnt require skills, if you know the game then you can start to play and in order to win you need to become lucky. However there are some games that if you have a knowledge its an edge to predict who might win (e.g. sports betting).
you answered it well, it does not require skills if you are gambling for fun, but there are games like sports betting where you can get use of your skills to win. Sports betting is a skilled based type of game, anyone can start their journey as a sports bettor as it's like trading where you need to analyze.
and also Gambling gives more chances if you are lucky while in Trading you must be completely skilled and with Big knowledge before truly Gains profit.
and Gambling usually a gateway to have fun and challenge while Trading mostly do for people to make a living,as i have some friend that leave their regular work to focus in Trading while the person i know lose Hos job because of gambling those are different way of not having work.