But at the same time, the losses of poor people can be quite insignificant, because they gamble with very small amounts of money that are left after all their essential payments. A rich person can afford to gamble with much larger sums, and as a result, they can much more easily and quickly lose large amounts of money and suffer huge losses, which can lead to a faster development of addiction due to the desire to win back what was lost.
You are getting it wrong.
Most poor people gamble to earn, Most rich people gamble mostly for fun. The money may appear insignificant, but it's significant to a poor person by their standards same thing with rich people, you might think the amount is huge, but it is not that significant to them. Drake for example has lost over $8M in gambling, His estimated net worth is about $250M, does he seem la more likely candidate for gambling addiction compared to some guy who barely makes $1,000 a month and gambles up over a half of it?
It reminds me an episode of the new testament, in which Jesus himself talk about how wealth is relative. It think it had something to do with a poor woman who gave her last coins to the temple, as mentioned how what she gave was certainly of more value than other have given, because in the eyes of that poor woman those remaining couple of coins were everything she had left and represented a important amount of money, while in the eyes of someone who was rich and could give hundreds of pieces of silver to the temple and it would be nothing in comparison to the rest of their accumulated wealth.
It is the same with gambling and with the rest of the aspects of life, I have seen people who would struggle to get 20$, and that would be a serious amount of money, a sum which they would not dare to deposit onto a casino, at the same time there are people paying 20$ per spin on slot machines.
Each one of us have our own perspective on what is "much" and "few" money.