Who doesn’t use Instagram today?
Instagram can easily make money from your pictures by selling it to third parties without any authorization from the owner. Now, people feel violated, they want to deactivate their account due to privacy rights.
A few years ago, there was a similar situation with Facebook. A lot of people were panicking because they felt violated.
Look at Facebook now, they have more than 1 billion users. Facebook makes their money in other ways.
Just like Facebook, users didn’t delete their account, and the same will happen with Instagram.