Pretty sure its not his strategy. Its also not the sites fault. Basically that's why its called gambling and usually you lose more than you win. Hence many just do it for fun.
True. Otherwise, we'd have called it strategy game instead of gambling.
You are wrong. For gambling you need luck but it can help if you got a good strategy. For example in roulette if you always play red and black you can only lose. Hence bad strategy ;-)
What does Red & Black signify in Roulette?
You do not know Roulette?
The game goes as follows.. You have 37 numbers to bet on and each number has the color black or red except of the 0. The 0 has no color... You have several possibilities to bet on.. You can choose a number, a color, odd or even and several other possibilities. If you want to know more about Roulette here is the Wikipedia article
https://en.wikipedia.org/wiki/Roulette