Then delete your photos.
Then delete your account.
Well, that's what I would do if I had ever used it.
But I urge you all to do the same (you can keep the photos on your own pc, fine, but just take them off the website).
If we let companies like this get away with massive copyright infringements like this, then more will be tempted to do the same. Send a message now, otherwise facebook and flickr will be next, then anything you've ever sent on gmail and yahoo, and after that Canon will claim all the photos you ever make on one of their cameras.