I agree with you if you are just an ordinary gambler and you are just going to play with your excess money and you are just going to treat it for fun. Then you are not going to earn with it. But if you have ample capital as you play gambling for sure even you are going to lose you are able to manage to get back your loses as you have a lot of capital. And most of the people that has a lot of capital with gambling they are the ones who are earning easily with gambling.
I don't really think they can earn an easy money over gambling cause their is no such thing as easy earning over gambling even if they have a large amount of capital it is surely not infinite to not decrease a certain amount of numbers right cause nothing would last that long in these world even a big company get bankrupt too, maybe the method in playing gambling are easy to understand but the randomness in winning over it would not required a knowledge cause it is just a mere coincidence.
I think everything you say can not be realized. Because we can't do a definite prediction And that we can do is play in a good way and not do gambling by way of the greedy or vain. And also the advantage that we get in the gambling is only temporary, so gambling only for pleasure and not applicable for profit
Predictions can be done but only on sports betting, because if we know the game both teams we can predict effectively. But for other gambling other than sports betting, we can not make predictions because the only game that requires luck. And gains in gambling it can not be obtained, and it tends to temporarily.
therefore, I think sports gambling is the easiest of other types of gambling. because sports gambling seem easy to predict, any result can happen without cheating, because we can see a fair match. but other games are difficult to predict and really depends on luck.