A personal computer or laptop costs around as much as a mobile phone. So I am not sure where exactly you get off on calling me rich. Also, I am not a kid. I think that either you are perhaps the kid who has yet to enter the world of working adults and therefor does not understand that buying a laptop or mobile phone is not such a huge, life-changing deal, even in poor countries. Hell, if you were really desperate, you could buy a very cheap, old used one and it would work just fine.
Playing on a small screen, is uncomfortable. No matter how you look at it.
I would say it all depends on your personal choice that how you want to gamble like for me Mobile phone do the job well but I would say in most of the countries laptop/desktop are expensive compared to mobile phones and all can't afford to buy them so they prefer gambling on their phones only.
This discussion is basically talking about peoples preferences and not understanding each other, but we should not go towards bashing others preferences neither.
I do find mobile phones to be not too easy to use for gambling too, but I am not going to say that it's terrible for everyone neither because that's not true, half of the world prefers to gamble on their phone which means it's fine for them and I am happy for them, do whatever you want to do and not what I think is better or not, I will do what I think is best for me. People need to find the difference between saying "I prefer this way" and "this is the better way" because those two sentences are very different.