Have clickable elements been a default cursor?

We often get a confusion whether to use hand cursor or default cursors for buttons and other clickable elements. If you consider iCloud and Onedrive both are having their native and web Interfaces, In Native they use default cursor on a button, while in the web they use the hand cursor on the buttons.

But when the same os and web applications come to our touch screens(Notepad/Tab/mobiles) our hand acts as cursor which try to interact with the clickable elements.