Gambling is a big different from trading where we can share and take used of the same strategies but in gambling, it seems to be not applicable. Gambling is somewhat a big competition where everyone wants to win and so keeping our own strategies is a tool to make big days over the others..
Believing if there is any strategy in gambling also false. You can't and never can find any work strategy to win in gambling, you might be can win today, but when you are using same strategy on tommorrow, you can lose (i've experienced it)
Yes, your right, I experienced too. When we use strategy, we need to modify the strategy in every time we play so we can have more chance to win, although it is not guaranteed to win.
I think he could still share strategy to people and don't care if the strategy will work for them or not because at least, he can teach people to make their own strategy. It will help people to understand how to make a strategy in one game. And if that people can win from his strategy, that will a big help to him as there is no same strategy that will always work in gambling.