I don't mean just from a fault perspective - if I buy something online in general I can get a refund later if I merely change my mind (although I don't know if

I don't mean just from a fault perspective - if I buy something online in general I can get a refund later if I merely change my mind (although I don't know if this applies to purely digital purchases). In the UK, most of the times you see "No refunds", the sign in question has zero effect.