Since you've posted it here in gambling board, I think you should specify that it's all about where we're more comfortable to gamble, whether it's through desktop or smartphones. The mods might move it if the discussion is like no specified activity which pertains to gambling although I wholly understand what it is.
That is exactly what I thought.
If we are talking about gambling, as we suppose, I also prefer desktop, there is a big difference in functionality, the bigger screen, better handling with the mouse and so on.
<...>but there seems to be many people who would rather use their phone. Is that because they do not have access to a desktop computer? It may also be a regional issue, the same as people that do not use a browser?
I don't think it's a regional issue, probably a matter of convenience. Even if I prefer desktop, I can sometimes use my mobile phone from the sofa lying down instead of having to sit at the computer.
I just think people who prefer to be on their phones are out of the house more and want to gamble wherever they are.
This seems a plausible motive.