they don't know
I've seen many subcriber/pay items (from here, TSR) for free on sites. I find it funny that those creators of those items are complaining so often about "don't upload my pay items to anysite" knowing that they are. besides, EA clearly stated that those people are not suppose to do that. so I say to those creators, you made your own bed...
see I like having my items free because that's the way it should be, they should be free to everyone. and I don't feel that it's right to cheat people, it's just wrong.