When Facebook bought Instagram, it updated the retroactively updatable contract.
Old terms, pre-Facebook:
Instagram disclaimed ownership rights in content users post.
So Instagram could manage posted content, users agreed to a non-exclusive limited license to use, modify, delete from, add to, publicly perform, publicly display, reproduce, and translate content users posted on Instagram.
New terms, after Facebook:
Instagram disclaims ownership of content
Users agree to a transferable and sub-licensable license to use the content users post with no explicit limitations. New terms added a liability waiver.
The new license agreement means users have no control over what Instagram does with their content.