Also sad that Dropbox isn't investing in a migration story, though I saw Google do the same thing with Picnik when that was shutdown.
It's most likely that users use this service from their smartphones and so it's not like they are somehow going to miss the notifications they will keep sending perhaps every week your photos are still on their servers
So you're saying it's likely most of their users are completely unable to back up their photos at all? (since one of the top 2 smartphone OSes doesn't support downloading ZIP files, and the users of the other OS probably don't have enough free space on their MicroSD card)
Not so much, I guess.
I can't imagine there are many uses who feel like snapjoy delivered on the sentiment of their "Snapjoy is joining Dropbox" post.
"Stay tuned, the best is yet to come" doesn't usually imply we'll give you 1 months notice and then delete all your photos.