What nitwit modded you insightful?
Look, I pay money for a hotel room-- that fee goes to an expected level of security. I pay nothing for Instagram's services-- no expectation of security, or of any service at all. Is instagram an online storage business? No. Therefore, the pictures you upload are not there for you to store-- they're for Instagram to use however they want... your pictures are free, as in beer.
Point of fact, since no one is paying you for your pictures, they are literally worth nothing.
Link to an XKCD in case you're still confused as to what storage, business, and free is.
It's all about leverage. And it looks to me like Instagram doesn't have much of it.