When you invest in an opportunity to make a return profit and are aware of the "non-guaranteed" risks involved, it's gambling. It doesn't matter whether it's poker, bingo, the lottery, property investments, stocks, bitcoin, etc. Having a skill set to make informed decisions separates the good investments from the flips. AA: good investment. 72off-suit: not so good investment.
Pennsylvania Ave.: good investment. Baltic Ave: not so good investment.
The variance is where the gamble comes in.
I lost my ass by the big-stack at the table tonight. With the blinds 600/1200 and a small raise from the big-stack to my immediate right, I raised it up in 2nd seat w/QQ to 8K and everyone folds except the big-stack who insta-calls. After a check-call flop bet we both check the turn that pairs the board; a 4 hits the river and he shoves all in. Mind you, the flop was 3A5 w/a 3 on the turn. He has everyone at the table covered and like an idiot I just don't believe him, and I call only to see him turn over 62. Now he can put a hotel on Baltic.
Sorry, still a little steamy. Anyway, I think I knew better to call but I did anyway. My point is I knew to fold but didn't, so I was, very much, gambling at that point. I can live w/that. I hate it but all I can do is learn from it.