Origin allows unconditional refunds with 24 hours, GOG is refund within 30 days if there are technical problems that they are unable to solve / game breaking bugs they can't fix/get fixed.
I bet EA's Origin forces you to be online to play the game then.
Sidenote, a curse on EA for misusing Origin's old name for their fail service. -_-
Yeap. No good and evil, no black and white. Just one huge gray blob.