ALL THE IMAGES in the screenshot from this post belong to Instagram forever, even if those posting them delete all their collateral and close their Instagram accounts. That is the biggest reason I use Flickr much more frequently than Instagram.
I'm also not a big fan of short videos of cats, something facilitated by Instagram.
The big problem with Instagram's terms is how easily they could become the industry standard. After all, Instagram is Facebook. And to many, Facebook is the internet.