Well, I'm not a lawyer, but ...
I don't think it's deliberately deceptive or aimed at gaining profit from your photos - imagine the stink if they, say, sent your photos to a news service and were paid for them - but the terms should, IMHO, be strengthened to clearly indicate that the photos will not be disseminated outside of the Service (and third party partners) nor used for any other purpose.
I think those terms are there to cover mirroring, backups, cloud services and sending to partners (and their systems) for printing and posting to you. There would be, at times, multiple copies of your photos in their, and their partners', systems and those partners may include some cheap print shop in China or India, for example.
Thanks for posting. Something to keep an eye on.