I am not agree with your opinion, crypto trading and gambling a bit different but both have high risks, because if you bought a project altcoin then it can go down at any moment, and it's can also huge up at any time, on the other hand gambling is also big risks, your uncle is 80% right predictor but it seems not guaranteed profits, 9 to 5 job workers have enough time to research about market.
What makes gambling to be what it is, is when you can not give a prediction and be sure that it will happen the exact way that you have predicted but trading is not like that. When trading, you can get your prediction always right if you make use of previous charts to make your analysis but when gambling, even the past history can not guarantee you that you are going to win your bet. Gambling is very different from trading, the two are not the same as some people use to think they are. With beginners luck, you can make profits from either of them but as you keep trading, you will begin to lose because you do not have any experience and was just being lucky when you started trading. Trading requires more efforts to be put into it then gambling.