All addiction regardless of what type is not good for your life because it can cost everything, gambling and video game are both for fun, you feel entertained and challenged at the same time, the only difference is that in gambling you can gain profits if the odds is with you unlike when in video game you are always spending without getting something in return.
I reckon that addiction isn't good in all aspects of our lives. There's already a connection with the entire gaming to gambling industry, the numerous operation of sportsbooks that has e-sports matches on their lists.
I'm now looking to that point of a gamer who's been playing hard and there can be a deep reason why he's doing it. I remember a video about a gamer who's been playing all day long to fight his depression because he has found friends and happiness through that game.
The point is, gambling and gaming has connection but a gamer can still decide whether he'll connect himself to gambling while playing his favorite video games.
A gamer might found a temporary friend or happiness through gaming but I don't think that will be the solution to his depression.
Sooner or later, he still needs to face the reality but yes, it might help him cope up from such deep trouble within himself at that moment.
But he should find another way how to face his troubles in life. A more sustainable one.