This is actually a totally understandable response to the flawed user profile/content ownership system on the PS3. Really the only thing that surprises me is that it took this long to happen!
Basically, on the 360 permissions work out such that your purchased content can be used by you or any other user on the console it was originally bought from and roams with you, but can only be used by you on other consoles. This means I can play SomeGame X with my friend at his home, but he can't play it once my account is gone.
As I understand it The PS3 ownership model doesn't seem to really do anything at all, so as another poster mentioned you can basically share PSN Games and DLC with abandon.
This didn't need to happen this way but somebody skimped on the planning stages for this whole downloadable content thing and left the door wide open to abuse. I'd love to see a way to digitally transfer ownership legitimately, but that is an argument for another day.
"Conversion, fastidious Goddess, loves blood better than brick, and feasts most subtly on the human will." -- Virginia Woolf, "Mrs. Dalloway"