I'm not quite sure if I understand it right that's why I need some clarifications. If it allows uploading then people can probably get images from the internet and upload it here to earn?
Yes people can do that. But there is a moderator to check the images. Not all images are accepted according to their terms. That simply means those images are not going to be accepted.
Well I have considered the idea of having moderators but it would be too hard to know if the picture is stolen. Don't you have a system that can identify those stolen images?
Indeed, this is the right idea, because I think the photos should be taken and uploaded directly by the author, and not taken from the Internet.