Who do you think gets Wily out of prison every time?
Hell, Wily's teleportation pads are just his way of getting the blue boy's data so he can look at him under every angle. He shares that data with Light who then has a nice big collection of data.
But after a while, Light feels guilty, deletes everything and moves on. Until one night he gets an itch that regular porn can't scratch, and he frees Wily again.