It is quite technical. Maybe I explain it in a simply way:
For more of the program language, they use pseudo-random to generate number. Which mean if the mathematician have enough data, they can guess the next generate number from the historical data. So, more of the gambling site do some trick on their site to prevent player winner.
For Chazes, we use random.org, the third party api to generate number. Because random.org generate the randomness comes from atmospheric noise, so we cannot be predict the number.
This is the reason why Chazes always mention the random is true random, from random.org.
For more detail, please visit:
https://www.random.org/Thanks!