Can backup games ruin the laser ?
Speaking as one who works in the laser industry, NO.
If they could, CDRs would screw up your stereo equipment and all your optical media drives on your PC would die also. The difference between a pressed and a burnt optical disc is more likely to show itself in terms of degradation of the media itself rather than the player.
Now don't be so silly.......... boogeymen cannot hide on your wardrobe either, and half-and-half bread will not cause your toaster to explode in a fireball.
Steroids, however,
will cause your testicles to shrink !