The best way to get a system of 'due process' is for a user to successfully argue in court that their social media metadata constitutes 'valuable consideration' that turns the user's relationship with Instagram into a contractual one and then ask the court to interpret Instagram's ToS rigidly.

But this is a very steep legal hill to climb (and I'm simplifying the issues considerably, at that). It's not that I think Instagram's actions here are reasonable; it's a terrible policy in a lot of ways. But ultimately it's the consumer's choice to sign up with a service or not.