Gambling is a verb is very different from gambling as an action. The things you talked about are gambling but they are not literally rolling a dice on a casino, that is why they are different. Plus on a normal day when you gamble about your life, you have no choice but to do that in order to move forward, we gambled on school answers because we had to give an answer, leaving it empty would only further your failure instead of maybe helping out, same with work, you have to gamble because you have to move forward, you can't live unemployed forever unless you are very lucky with money.

Everything in your life you gambled, you had to. On regular casinos you don't have to gamble, you can simply leave, plus casino literally tells you that you will lose on this gamble and you still do it.