"... leads to people who technically shouldn't be getting repairs under warranty to get them." They can only deny a warranty if the modification caused the dam

"... leads to people who technically shouldn't be getting repairs under warranty to get them." They can only deny a warranty if the modification caused the damage. However, they can claim it did and deny you even if it's not true. Leaving you basically only two options payup or pay lawyers and court fees ect.. to sue them.