The Instagram Terms of Use says:
We may change our Service and policies, and we may need to make changes to these Terms so that they accurately reflect our Service and policies. Unless otherwise required by law, we will notify you (for example, through our Service) before we make changes to these Terms and give you an opportunity to review them before they go into effect. Then, if you continue to use the Service, you will be bound by the updated Terms. If you do not want to agree to these or any updated Terms, you can delete your account, here.
As the court notes, “reserved to itself the unilateral and nonnegotiable right to vary every aspect of the performance required by the parties.”
So—if we follow Badie—this is itself a breach of the obligation of good faith.